GameManager.java

import java.util.Scanner;

public class GameManager {

    public void startGame(Scanner scanner, int[][] solutionBoard, int[][] puzzleBoard, Player player) {
        int[][] userBoard = BoardUtils.deepCopy(puzzleBoard);
        boolean[][] lockedWrongCells = new boolean[9][9];

        Difficulty level = player.getDifficulty();
        boolean showCorrectness = (level == Difficulty.EASY);
        boolean lockWrong = (level == Difficulty.EXTREME);
        int lives = 0;

        switch (level) {
            case HARD:
            lives = 5;
            break;
            case EXTREME:
            lives = 3;
            break;
            default:
            // EASY and MEDIUM do not use lives
            break;
        }

        int wrongAttempts = 0;

        while (!BoardUtils.isBoardFull(userBoard)) {
            BoardUtils.printBoard(userBoard);
            System.out.println("Lives: " + (lives > 0 ? lives : "∞") + " | Wrong Attempts: " + wrongAttempts);

            System.out.print("Enter row (0-8): ");
            int row = scanner.nextInt();
            System.out.print("Enter col (0-8): ");
            int col = scanner.nextInt();

            if (puzzleBoard[row][col] != 0) {
                System.out.println(" You cannot change this cell.");
                continue;
            }

            if (lockedWrongCells[row][col]) {
                System.out.println(" This cell is locked due to a wrong input earlier.");
                continue;
            }

            System.out.print("Enter number (1-9): ");
            int num = scanner.nextInt();

            if (num < 1 || num > 9) {
                System.out.println(" Invalid number. Try again.");
                continue;
            }

            if (solutionBoard[row][col] == num) {
                userBoard[row][col] = num;
                if (showCorrectness) System.out.println("✅ Correct!");
            } else {
                wrongAttempts++;

                if (level == Difficulty.HARD || level == Difficulty.EXTREME) {
                    lives--;
                    System.out.println(" Wrong! You lost a life.");
                    if (lives == 0) {
                        System.out.println(" Game Over! You've run out of lives.");
                        return;
                    }
                } else {
                    System.out.println(showCorrectness ? " Wrong input." : "");
                }

                if (lockWrong) {
                    lockedWrongCells[row][col] = true;
                }

                // Don't place incorrect number
                continue;
            }
        }

        // Game completed
        BoardUtils.printBoard(userBoard);
        System.out.println("🎉 You've completed the puzzle!");
        System.out.println("Wrong moves made: " + wrongAttempts);
        LeaderboardManager.updateLeaderboard(player);
    }
}