draft of new mode

crypto_clash_contract/contracts/Game.sol

@@ -40,6 +40,7 @@ contract Game {
         uint initialBet;
         uint gameId;
         bool isActive;
+        string gameMode; // "classic" for this contract
     }
 
     // Mapping from game ID to game state
@@ -112,6 +113,7 @@ contract Game {
 
         games[gameId].gameId = gameId;
         games[gameId].isActive = true;
+        games[gameId].gameMode = "classic";
         gameIds.push(gameId);
 
         return gameId;
@@ -454,7 +456,8 @@ contract Game {
             uint initialBet,
             Outcomes outcome,
             bool isActive,
-            uint returnGameId
+            uint returnGameId,
+            string memory gameMode
         )
     {
         GameState storage game = games[gameId];
@@ -465,7 +468,8 @@ contract Game {
             game.initialBet,
             game.outcome,
             game.isActive,
-            game.gameId
+            game.gameId,
+            game.gameMode
         );
     }
 

crypto_clash_contract/contracts/GameMinusOne.sol

@@ -0,0 +1,709 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.7.3;
+
+contract GameMinusOne {
+    uint public constant BET_MIN = 1e16; // The minimum bet (0.01 ETH)
+    uint public constant REVEAL_TIMEOUT = 10 minutes; // Max delay of revelation phase
+    uint public constant COMMIT_TIMEOUT = 10 minutes; // Max delay of commit phase
+    uint public constant WITHDRAW_TIMEOUT = 10 minutes; // Max delay for withdrawal phase
+
+    enum Moves {
+        None,
+        Rock,
+        Paper,
+        Scissors
+    }
+
+    enum Outcomes {
+        None,
+        PlayerA,
+        PlayerB,
+        Draw,
+        PlayerATimeout,
+        PlayerBTimeout
+    } // Possible outcomes
+
+    enum GamePhase {
+        Registration,      // Waiting for players
+        InitialCommit,     // Players commit 2 moves each
+        FirstReveal,       // Players reveal both moves
+        Withdrawal,        // Players choose which move to withdraw
+        FinalCommit,       // Players commit their remaining move again (for fairness)
+        FinalReveal,       // Players reveal final move
+        Completed          // Game finished
+    }
+
+    struct Player {
+        address payable addr;
+        uint bet;
+        // Initial phase - 2 moves
+        bytes32 encrMove1;
+        bytes32 encrMove2;
+        Moves move1;
+        Moves move2;
+        // Withdrawal phase
+        uint withdrawnMoveIndex; // 1 or 2
+        // Final phase
+        bytes32 encrFinalMove;
+        Moves finalMove;
+        string nickname;
+    }
+
+    struct GameState {
+        Player playerA;
+        Player playerB;
+        Outcomes outcome;
+        GamePhase phase;
+        uint firstCommit;
+        uint firstReveal;
+        uint firstWithdraw;
+        uint firstFinalCommit;
+        uint firstFinalReveal;
+        uint initialBet;
+        uint gameId;
+        bool isActive;
+        string gameMode; // "minusone" for this contract
+    }
+
+    // Mapping from game ID to game state
+    mapping(uint => GameState) private games;
+
+    // Array to track all game IDs (for enumeration)
+    uint[] private gameIds;
+
+    // Counter for generating unique game IDs
+    uint private nextGameId = 1;
+
+    // ------------------------- Registration ------------------------- //
+
+    modifier validBet(uint gameId) {
+        require(msg.value >= BET_MIN, "Minimum bet not met");
+        require(
+            games[gameId].initialBet == 0 ||
+                msg.value == games[gameId].initialBet,
+            "Bet value must match initial bet"
+        );
+        _;
+    }
+
+    // Register a player to an existing game or create a new game.
+    // If gameId is 0, player will join or create the first available game.
+    // Return player's ID and game ID upon successful registration.
+    function register(
+        uint gameId,
+        string memory nickname
+    )
+        public
+        payable
+        validBet(gameId)
+        returns (uint playerId, uint returnGameId)
+    {
+        // If gameId is 0, find an open game or create a new one
+        if (gameId == 0) {
+            gameId = createNewGame();
+        }
+
+        require(games[gameId].isActive, "Game is not active");
+        require(games[gameId].phase == GamePhase.Registration, "Game already started");
+        require(bytes(nickname).length > 0, "Nickname cannot be empty");
+        require(bytes(nickname).length <= 20, "Nickname too long (max 20 characters)");
+
+        GameState storage game = games[gameId];
+
+        if (game.playerA.addr == address(0x0)) {
+            game.playerA.addr = payable(msg.sender);
+            game.playerA.nickname = nickname;
+            game.initialBet = msg.value;
+            return (1, gameId);
+        } else if (game.playerB.addr == address(0x0)) {
+            require(
+                msg.sender != game.playerA.addr,
+                "Cannot play against yourself"
+            );
+            game.playerB.addr = payable(msg.sender);
+            game.playerB.nickname = nickname;
+            
+            // Both players registered, automatically start the game
+            game.phase = GamePhase.InitialCommit;
+            
+            return (2, gameId);
+        }
+
+        revert("Game is full");
+    }
+
+
+    // Create a new game
+    function createNewGame() private returns (uint) {
+        uint gameId = nextGameId;
+        nextGameId++;
+
+        games[gameId].gameId = gameId;
+        games[gameId].isActive = true;
+        games[gameId].phase = GamePhase.Registration;
+        games[gameId].gameMode = "minusone";
+        gameIds.push(gameId);
+
+        return gameId;
+    }
+
+    // ------------------------- Initial Commit (2 moves) ------------------------- //
+
+    modifier isRegistered(uint gameId) {
+        require(gameId != 0, "Invalid game ID");
+        require(
+            msg.sender == games[gameId].playerA.addr ||
+                msg.sender == games[gameId].playerB.addr,
+            "Player not registered in this game"
+        );
+        _;
+    }
+
+    // Commit two moves for the initial phase
+    // encrMove1 and encrMove2 must be "<1|2|3>-password" hashed with keccak256
+    function commitInitialMoves(uint gameId, bytes32 encrMove1, bytes32 encrMove2) 
+        public 
+        isRegistered(gameId) 
+        returns (bool) 
+    {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is no longer active");
+        require(game.phase == GamePhase.InitialCommit, "Not in initial commit phase");
+        require(encrMove1 != bytes32(0) && encrMove2 != bytes32(0), "Encrypted moves cannot be zero");
+        require(encrMove1 != encrMove2, "Both moves must be different");
+        
+        // Check timeout
+        if (game.firstCommit != 0) {
+            require(block.timestamp <= game.firstCommit + COMMIT_TIMEOUT, "Commit phase timeout expired");
+        }
+        
+        // Track first commit timestamp
+        if (game.firstCommit == 0) {
+            game.firstCommit = block.timestamp;
+        }
+        
+        // Store encrypted moves
+        if (msg.sender == game.playerA.addr) {
+            require(game.playerA.encrMove1 == bytes32(0), "Player A already committed");
+            game.playerA.encrMove1 = encrMove1;
+            game.playerA.encrMove2 = encrMove2;
+        } else if (msg.sender == game.playerB.addr) {
+            require(game.playerB.encrMove1 == bytes32(0), "Player B already committed");
+            game.playerB.encrMove1 = encrMove1;
+            game.playerB.encrMove2 = encrMove2;
+        } else {
+            revert("Caller not registered");
+        }
+        
+        // Check if both players have committed, advance to reveal phase
+        if (game.playerA.encrMove1 != bytes32(0) && game.playerB.encrMove1 != bytes32(0)) {
+            game.phase = GamePhase.FirstReveal;
+            game.firstReveal = 0; // Reset for reveal phase
+        }
+        
+        return true;
+    }
+
+    // ------------------------- First Reveal (2 moves) ------------------------- //
+
+    // Reveal both initial moves
+    // clearMove1 and clearMove2 must be the original strings used for hashing
+    function revealInitialMoves(uint gameId, string memory clearMove1, string memory clearMove2)
+        public
+        isRegistered(gameId)
+        returns (Moves, Moves)
+    {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is no longer active");
+        require(game.phase == GamePhase.FirstReveal, "Not in first reveal phase");
+        
+        // Check timeout
+        if (game.firstReveal != 0) {
+            require(block.timestamp <= game.firstReveal + REVEAL_TIMEOUT, "Reveal phase timeout expired");
+        }
+        
+        bytes32 encrMove1 = keccak256(abi.encodePacked(clearMove1));
+        bytes32 encrMove2 = keccak256(abi.encodePacked(clearMove2));
+        Moves move1 = Moves(getFirstChar(clearMove1));
+        Moves move2 = Moves(getFirstChar(clearMove2));
+        
+        require(move1 != Moves.None && move2 != Moves.None, "Invalid moves");
+        require(move1 != move2, "Both moves must be different");
+        
+        // Verify and store moves
+        if (msg.sender == game.playerA.addr) {
+            require(encrMove1 == game.playerA.encrMove1 && encrMove2 == game.playerA.encrMove2, 
+                "Hash mismatch for Player A");
+            game.playerA.move1 = move1;
+            game.playerA.move2 = move2;
+        } else if (msg.sender == game.playerB.addr) {
+            require(encrMove1 == game.playerB.encrMove1 && encrMove2 == game.playerB.encrMove2,
+                "Hash mismatch for Player B");
+            game.playerB.move1 = move1;
+            game.playerB.move2 = move2;
+        } else {
+            revert("Caller not registered");
+        }
+        
+        // Start reveal timer on first reveal
+        if (game.firstReveal == 0) {
+            game.firstReveal = block.timestamp;
+        }
+        
+        // Check if both players have revealed, advance to withdrawal phase
+        if (game.playerA.move1 != Moves.None && game.playerB.move1 != Moves.None) {
+            game.phase = GamePhase.Withdrawal;
+            game.firstWithdraw = 0; // Reset for withdrawal phase
+        }
+        
+        return (move1, move2);
+    }
+
+    // ------------------------- Withdrawal Phase ------------------------- //
+
+    // Choose which move to withdraw (1 or 2)
+    function withdrawMove(uint gameId, uint moveIndex)
+        public
+        isRegistered(gameId)
+        returns (bool)
+    {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is no longer active");
+        require(game.phase == GamePhase.Withdrawal, "Not in withdrawal phase");
+        require(moveIndex == 1 || moveIndex == 2, "Move index must be 1 or 2");
+        
+        // Check timeout
+        if (game.firstWithdraw != 0) {
+            require(block.timestamp <= game.firstWithdraw + WITHDRAW_TIMEOUT, "Withdrawal phase timeout expired");
+        }
+        
+        // Store withdrawal choice
+        if (msg.sender == game.playerA.addr) {
+            require(game.playerA.withdrawnMoveIndex == 0, "Player A already withdrew");
+            game.playerA.withdrawnMoveIndex = moveIndex;
+        } else if (msg.sender == game.playerB.addr) {
+            require(game.playerB.withdrawnMoveIndex == 0, "Player B already withdrew");
+            game.playerB.withdrawnMoveIndex = moveIndex;
+        } else {
+            revert("Caller not registered");
+        }
+        
+        // Start withdrawal timer on first withdrawal
+        if (game.firstWithdraw == 0) {
+            game.firstWithdraw = block.timestamp;
+        }
+        
+        // Check if both players have withdrawn, advance to final commit phase
+        if (game.playerA.withdrawnMoveIndex != 0 && game.playerB.withdrawnMoveIndex != 0) {
+            game.phase = GamePhase.FinalCommit;
+            game.firstFinalCommit = 0; // Reset for final commit
+        }
+        
+        return true;
+    }
+
+    // ------------------------- Final Commit (remaining move) ------------------------- //
+
+    // Commit the remaining move again (for fairness and to prevent cheating)
+    function commitFinalMove(uint gameId, bytes32 encrFinalMove)
+        public
+        isRegistered(gameId)
+        returns (bool)
+    {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is no longer active");
+        require(game.phase == GamePhase.FinalCommit, "Not in final commit phase");
+        require(encrFinalMove != bytes32(0), "Encrypted move cannot be zero");
+        
+        // Check timeout
+        if (game.firstFinalCommit != 0) {
+            require(block.timestamp <= game.firstFinalCommit + COMMIT_TIMEOUT, "Final commit timeout expired");
+        }
+        
+        // Store encrypted final move
+        if (msg.sender == game.playerA.addr) {
+            require(game.playerA.encrFinalMove == bytes32(0), "Player A already committed final move");
+            game.playerA.encrFinalMove = encrFinalMove;
+        } else if (msg.sender == game.playerB.addr) {
+            require(game.playerB.encrFinalMove == bytes32(0), "Player B already committed final move");
+            game.playerB.encrFinalMove = encrFinalMove;
+        } else {
+            revert("Caller not registered");
+        }
+        
+        // Start final commit timer on first commit
+        if (game.firstFinalCommit == 0) {
+            game.firstFinalCommit = block.timestamp;
+        }
+        
+        // Check if both players have committed, advance to final reveal phase
+        if (game.playerA.encrFinalMove != bytes32(0) && game.playerB.encrFinalMove != bytes32(0)) {
+            game.phase = GamePhase.FinalReveal;
+            game.firstFinalReveal = 0; // Reset for final reveal
+        }
+        
+        return true;
+    }
+
+    // ------------------------- Final Reveal ------------------------- //
+
+    // Reveal the final move and determine winner
+    function revealFinalMove(uint gameId, string memory clearFinalMove)
+        public
+        isRegistered(gameId)
+        returns (Moves)
+    {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is no longer active");
+        require(game.phase == GamePhase.FinalReveal, "Not in final reveal phase");
+        
+        // Check timeout
+        if (game.firstFinalReveal != 0) {
+            require(block.timestamp <= game.firstFinalReveal + REVEAL_TIMEOUT, "Final reveal timeout expired");
+        }
+        
+        bytes32 encrFinalMove = keccak256(abi.encodePacked(clearFinalMove));
+        Moves finalMove = Moves(getFirstChar(clearFinalMove));
+        
+        require(finalMove != Moves.None, "Invalid move");
+        
+        // Verify and store final move
+        if (msg.sender == game.playerA.addr) {
+            require(encrFinalMove == game.playerA.encrFinalMove, "Hash mismatch for Player A final move");
+            // Verify this is the non-withdrawn move
+            Moves expectedMove = game.playerA.withdrawnMoveIndex == 1 ? game.playerA.move2 : game.playerA.move1;
+            require(finalMove == expectedMove, "Final move must be the non-withdrawn move");
+            game.playerA.finalMove = finalMove;
+        } else if (msg.sender == game.playerB.addr) {
+            require(encrFinalMove == game.playerB.encrFinalMove, "Hash mismatch for Player B final move");
+            // Verify this is the non-withdrawn move
+            Moves expectedMove = game.playerB.withdrawnMoveIndex == 1 ? game.playerB.move2 : game.playerB.move1;
+            require(finalMove == expectedMove, "Final move must be the non-withdrawn move");
+            game.playerB.finalMove = finalMove;
+        } else {
+            revert("Caller not registered");
+        }
+        
+        // Start final reveal timer on first reveal
+        if (game.firstFinalReveal == 0) {
+            game.firstFinalReveal = block.timestamp;
+        }
+        
+        // Check if both players have revealed final moves, determine outcome
+        if (game.playerA.finalMove != Moves.None && game.playerB.finalMove != Moves.None) {
+            determineOutcome(gameId);
+        }
+        
+        return finalMove;
+    }
+
+    // Determine the final outcome based on both players' final moves
+    function determineOutcome(uint gameId) private {
+        GameState storage game = games[gameId];
+        
+        if (game.playerA.finalMove == game.playerB.finalMove) {
+            game.outcome = Outcomes.Draw;
+        } else if (
+            (game.playerA.finalMove == Moves.Rock && game.playerB.finalMove == Moves.Scissors) ||
+            (game.playerA.finalMove == Moves.Paper && game.playerB.finalMove == Moves.Rock) ||
+            (game.playerA.finalMove == Moves.Scissors && game.playerB.finalMove == Moves.Paper)
+        ) {
+            game.outcome = Outcomes.PlayerA;
+        } else {
+            game.outcome = Outcomes.PlayerB;
+        }
+        
+        game.phase = GamePhase.Completed;
+    }
+
+    // Return first character of a given string.
+    // Returns 0 if the string is empty or the first character is not '1','2' or '3'.
+    function getFirstChar(string memory str) private pure returns (uint) {
+        bytes memory b = bytes(str);
+        if (b.length == 0) {
+            return 0;
+        }
+        bytes1 firstByte = b[0];
+        if (firstByte == 0x31) {
+            return 1;
+        } else if (firstByte == 0x32) {
+            return 2;
+        } else if (firstByte == 0x33) {
+            return 3;
+        } else {
+            return 0;
+        }
+    }
+
+    // ------------------------- Result ------------------------- //
+
+    // Compute the outcome and pay the winner(s).
+    // Return the outcome.
+    function getOutcome(uint gameId) public returns (Outcomes) {
+        GameState storage game = games[gameId];
+        
+        require(game.isActive, "Game is not active");
+        require(game.phase == GamePhase.Completed, "Game not completed yet");
+        require(game.outcome != Outcomes.None, "Outcome not yet determined");
+
+        address payable addrA = game.playerA.addr;
+        address payable addrB = game.playerB.addr;
+        uint betPlayerA = game.initialBet;
+
+        // Reset and cleanup
+        resetGame(gameId); // Reset game before paying to avoid reentrancy attacks
+        pay(addrA, addrB, betPlayerA, game.outcome);
+
+        return game.outcome;
+    }
+
+    // Pay the winner(s).
+    function pay(
+        address payable addrA,
+        address payable addrB,
+        uint betPlayerA,
+        Outcomes outcome
+    ) private {
+        if (outcome == Outcomes.PlayerA) {
+            addrA.transfer(betPlayerA * 2);
+        } else if (outcome == Outcomes.PlayerB) {
+            addrB.transfer(betPlayerA * 2);
+        } else {
+            addrA.transfer(betPlayerA);
+            addrB.transfer(betPlayerA);
+        }
+    }
+
+    // Pay to one player and slash the other (timeout resolution).
+    function payWithSlash(
+        address payable winner,
+        address payable loser,
+        uint betAmount
+    ) private {
+        // Winner gets both bets
+        winner.transfer(betAmount * 2);
+        // Loser gets nothing (slashed)
+    }
+
+    // Reset a specific game.
+    function resetGame(uint gameId) private {
+        GameState storage game = games[gameId];
+
+        // Mark game as inactive
+        game.isActive = false;
+
+        // Note: We keep the game data in the mapping for reference
+        // but players are now free to join other games
+    }
+
+    // ------------------------- Helpers ------------------------- //
+
+    // Return contract balance
+    function getContractBalance() public view returns (uint) {
+        return address(this).balance;
+    }
+
+    // Return player's ID in their active game
+    function whoAmI(uint gameId) public view returns (uint) {
+        if (gameId == 0) {
+            return 0;
+        }
+
+        GameState storage game = games[gameId];
+        if (msg.sender == game.playerA.addr) {
+            return 1;
+        } else if (msg.sender == game.playerB.addr) {
+            return 2;
+        } else {
+            return 0;
+        }
+    }
+
+    // Get the current phase of the game
+    function getGamePhase(uint gameId) public view returns (GamePhase) {
+        return games[gameId].phase;
+    }
+
+    // Get time remaining in current phase
+    function getTimeLeft(uint gameId) public view returns (int) {
+        if (gameId == 0) return 0;
+
+        GameState storage game = games[gameId];
+        
+        if (game.phase == GamePhase.InitialCommit && game.firstCommit != 0) {
+            uint deadline = game.firstCommit + COMMIT_TIMEOUT;
+            if (block.timestamp >= deadline) return 0;
+            return int(deadline - block.timestamp);
+        } else if (game.phase == GamePhase.FirstReveal && game.firstReveal != 0) {
+            uint deadline = game.firstReveal + REVEAL_TIMEOUT;
+            if (block.timestamp >= deadline) return 0;
+            return int(deadline - block.timestamp);
+        } else if (game.phase == GamePhase.Withdrawal && game.firstWithdraw != 0) {
+            uint deadline = game.firstWithdraw + WITHDRAW_TIMEOUT;
+            if (block.timestamp >= deadline) return 0;
+            return int(deadline - block.timestamp);
+        } else if (game.phase == GamePhase.FinalCommit && game.firstFinalCommit != 0) {
+            uint deadline = game.firstFinalCommit + COMMIT_TIMEOUT;
+            if (block.timestamp >= deadline) return 0;
+            return int(deadline - block.timestamp);
+        } else if (game.phase == GamePhase.FinalReveal && game.firstFinalReveal != 0) {
+            uint deadline = game.firstFinalReveal + REVEAL_TIMEOUT;
+            if (block.timestamp >= deadline) return 0;
+            return int(deadline - block.timestamp);
+        }
+        
+        return int(COMMIT_TIMEOUT); // Default timeout
+    }
+
+    // Resolve a game that has timed out
+    function resolveTimeout(uint gameId) public isRegistered(gameId) {
+        GameState storage game = games[gameId];
+        require(game.isActive, "Game is not active");
+        
+        address caller = msg.sender;
+        address payable winner = payable(caller);
+        
+        bool timeoutOccurred = false;
+        
+        // Check for timeout in various phases
+        if (game.phase == GamePhase.InitialCommit && game.firstCommit != 0) {
+            if (block.timestamp > game.firstCommit + COMMIT_TIMEOUT) {
+                // Player who didn't commit loses
+                if (caller == game.playerA.addr && game.playerB.encrMove1 == bytes32(0)) {
+                    game.outcome = Outcomes.PlayerA;
+                    timeoutOccurred = true;
+                } else if (caller == game.playerB.addr && game.playerA.encrMove1 == bytes32(0)) {
+                    game.outcome = Outcomes.PlayerB;
+                    timeoutOccurred = true;
+                }
+            }
+        } else if (game.phase == GamePhase.FirstReveal && game.firstReveal != 0) {
+            if (block.timestamp > game.firstReveal + REVEAL_TIMEOUT) {
+                // Player who didn't reveal loses
+                if (caller == game.playerA.addr && game.playerB.move1 == Moves.None) {
+                    game.outcome = Outcomes.PlayerA;
+                    timeoutOccurred = true;
+                } else if (caller == game.playerB.addr && game.playerA.move1 == Moves.None) {
+                    game.outcome = Outcomes.PlayerB;
+                    timeoutOccurred = true;
+                }
+            }
+        } else if (game.phase == GamePhase.Withdrawal && game.firstWithdraw != 0) {
+            if (block.timestamp > game.firstWithdraw + WITHDRAW_TIMEOUT) {
+                // Player who didn't withdraw loses
+                if (caller == game.playerA.addr && game.playerB.withdrawnMoveIndex == 0) {
+                    game.outcome = Outcomes.PlayerA;
+                    timeoutOccurred = true;
+                } else if (caller == game.playerB.addr && game.playerA.withdrawnMoveIndex == 0) {
+                    game.outcome = Outcomes.PlayerB;
+                    timeoutOccurred = true;
+                }
+            }
+        } else if (game.phase == GamePhase.FinalCommit && game.firstFinalCommit != 0) {
+            if (block.timestamp > game.firstFinalCommit + COMMIT_TIMEOUT) {
+                // Player who didn't commit final move loses
+                if (caller == game.playerA.addr && game.playerB.encrFinalMove == bytes32(0)) {
+                    game.outcome = Outcomes.PlayerA;
+                    timeoutOccurred = true;
+                } else if (caller == game.playerB.addr && game.playerA.encrFinalMove == bytes32(0)) {
+                    game.outcome = Outcomes.PlayerB;
+                    timeoutOccurred = true;
+                }
+            }
+        } else if (game.phase == GamePhase.FinalReveal && game.firstFinalReveal != 0) {
+            if (block.timestamp > game.firstFinalReveal + REVEAL_TIMEOUT) {
+                // Player who didn't reveal final move loses
+                if (caller == game.playerA.addr && game.playerB.finalMove == Moves.None) {
+                    game.outcome = Outcomes.PlayerA;
+                    timeoutOccurred = true;
+                } else if (caller == game.playerB.addr && game.playerA.finalMove == Moves.None) {
+                    game.outcome = Outcomes.PlayerB;
+                    timeoutOccurred = true;
+                }
+            }
+        }
+        
+        require(timeoutOccurred, "No timeout has occurred or caller is not the non-offending player");
+        
+        address payable loser = winner == game.playerA.addr ? game.playerB.addr : game.playerA.addr;
+        
+        // Reset game
+        resetGame(gameId);
+        
+        // Pay winner and slash offender
+        payWithSlash(winner, loser, game.initialBet);
+    }
+
+    // ------------------------- Game Management ------------------------- //
+
+    // Get details of a specific game (for viewing any game)
+    function getGameDetails(
+        uint gameId
+    )
+        public
+        view
+        returns (
+            Player memory playerA,
+            Player memory playerB,
+            uint initialBet,
+            Outcomes outcome,
+            GamePhase phase,
+            bool isActive,
+            uint returnGameId,
+            string memory gameMode
+        )
+    {
+        GameState storage game = games[gameId];
+        require(game.gameId != 0, "Game does not exist");
+        return (
+            game.playerA,
+            game.playerB,
+            game.initialBet,
+            game.outcome,
+            game.phase,
+            game.isActive,
+            game.gameId,
+            game.gameMode
+        );
+    }
+
+    // Get all active game IDs
+    function getActiveGameIds() public view returns (uint[] memory) {
+        uint activeCount = 0;
+
+        // Count active games
+        for (uint i = 0; i < gameIds.length; i++) {
+            if (games[gameIds[i]].isActive) {
+                activeCount++;
+            }
+        }
+
+        // Build array of active game IDs
+        uint[] memory activeIds = new uint[](activeCount);
+        uint index = 0;
+        for (uint i = 0; i < gameIds.length; i++) {
+            if (games[gameIds[i]].isActive) {
+                activeIds[index] = gameIds[i];
+                index++;
+            }
+        }
+
+        return activeIds;
+    }
+
+    // Advance game to initial commit phase (called automatically after both players register)
+    function startGame(uint gameId) public {
+        GameState storage game = games[gameId];
+        require(game.isActive, "Game is not active");
+        require(game.phase == GamePhase.Registration, "Game already started");
+        require(game.playerA.addr != address(0) && game.playerB.addr != address(0), "Both players must be registered");
+        
+        game.phase = GamePhase.InitialCommit;
+    }
+}

crypto_clash_frontend/app/clash/GameList.tsx

@@ -26,6 +26,7 @@ export default function GameList({
   const [loading, setLoading] = useState(false);
   const [newGameBet, setNewGameBet] = useState<string>("0.01");
   const [newGameNickname, setNewGameNickname] = useState<string>("");
+  const [gameMode, setGameMode] = useState<string>("classic"); // "classic" or "minusone"
   const [joinNicknames, setJoinNicknames] = useState<Map<number, string>>(new Map());
   const [refreshInterval, setRefreshInterval] = useState<NodeJS.Timeout | null>(null);
   const [userGameIds, setUserGameIds] = useState<Set<number>>(new Set());
@@ -39,7 +40,16 @@ export default function GameList({
 
       for (const gameId of activeGameIds) {
         const details = await contract.methods.getGameDetails(gameId).call();
-        gameDetails.push(details);
+        // Map contract response to GameDetails type
+        gameDetails.push({
+          playerA: details[0],
+          playerB: details[1],
+          initialBet: details[2],
+          outcome: Number(details[3]),
+          isActive: details[4],
+          returnGameId: Number(details[5]),
+          gameMode: details[6] || "classic", // Fallback to "classic" for older contracts
+        });
       }
 
       setGames(gameDetails);
@@ -210,6 +220,14 @@ export default function GameList({
             onChange={(e) => setNewGameBet(e.target.value)}
             className="flex-1 min-w-[200px]"
           />
+          <select
+            value={gameMode}
+            onChange={(e) => setGameMode(e.target.value)}
+            className="flex-1 min-w-[200px] px-3 py-2 border border-slate-300 dark:border-slate-600 rounded-lg bg-white dark:bg-slate-800 text-slate-900 dark:text-white focus:outline-none focus:ring-2 focus:ring-blue-500"
+          >
+            <option value="classic">Classic Mode</option>
+            <option value="minusone">Minus One Mode (Squid Game)</option>
+          </select>
           <Button
             onClick={handleCreateGame}
             disabled={loading || !account || !contract}
@@ -220,7 +238,7 @@ export default function GameList({
           </Button>
         </div>
         <p className="text-xs text-slate-600 dark:text-slate-400 mt-2">
-          Enter your nickname and bet amount in ETH (e.g., 0.01 for 0.01 ETH).
+          Enter your nickname, bet amount, and choose game mode. Classic for standard Rock-Paper-Scissors, or Minus One for the Squid Game variant (2 moves, withdraw 1).
         </p>
       </div>
 
@@ -250,9 +268,14 @@ export default function GameList({
               >
                 {/* Game ID Header */}
                 <div className="mb-4 flex items-center justify-between">
+                  <div className="flex items-center gap-3">
                     <p className="font-semibold text-lg text-indigo-600 dark:text-indigo-400">
                       Game #{game.returnGameId}
                     </p>
+                    <span className="text-xs font-semibold px-2 py-1 rounded bg-purple-100 dark:bg-purple-900 text-purple-800 dark:text-purple-200">
+                      {game.gameMode === "minusone" ? "Minus One" : "Classic"}
+                    </span>
+                  </div>
                   <div className="flex gap-3 items-center">
                     <span className={`text-xs font-semibold px-2 py-1 rounded ${getGamePhase(game).color}`}>
                       {getGamePhase(game).phase}

crypto_clash_frontend/app/clash/GameModal.tsx

@@ -21,6 +21,7 @@ export type GameDetails = {
     outcome: number;
     isActive: boolean;
     returnGameId: number;
+    gameMode?: string; // "classic" or "minusone"
 };
 
 interface GameModalProps {