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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Snake Game</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            height: 100vh;
            margin: 0;
            background-color: #222;
            font-family: sans-serif;
            color: #fff;
        }

#game-board {
            display: grid;
            grid-template-columns: repeat(20, 1fr);
            grid-template-rows: repeat(20, 1fr);
            width: 400px; /* 20 cells * 20px per cell */
            height: 400px;
            border: 5px solid #000;
            background-color: #444;
            box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
        }

.cell {
            /* Base cell style (optional, for visibility) */
            box-sizing: border-box;
        }

.snake {
            background-color: limegreen;
            border: 1px solid darkgreen;
            border-radius: 2px;
        }

.food {
            background-color: red;
            border-radius: 50%;
            border: 1px solid darkred;
        }

#score {
            margin-top: 20px;
            font-size: 1.5em;
            color: #0f0;
        }

#message {
            margin-bottom: 10px;
            color: yellow;
            font-size: 1.2em;
        }
    </style>
</head>
<body>

<div id="message">Press Arrow Keys to Start!</div>
    <div id="game-board"></div>
    <div id="score">Score: 0</div>

// --- Initialization ---

function setupBoard() {
            gameBoard.innerHTML = '';
            for (let i = 0; i < BOARD_SIZE * BOARD_SIZE; i++) {
                const cell = document.createElement('div');
                cell.classList.add('cell');
                gameBoard.appendChild(cell);
            }
        }

function getCellIndex(x, y) {
            return y * BOARD_SIZE + x;
        }

// --- Game Logic ---

function updateGame() {
            if (!isRunning) return;

isChangingDirection = false;

// 1. Calculate new head position
            const head = { x: snake[0].x + direction.x, y: snake[0].y + direction.y };

// 2. Check for collisions (Walls or Self)
            if (head.x < 0 || head.x >= BOARD_SIZE ||
                head.y < 0 || head.y >= BOARD_SIZE ||
                snake.some(segment => segment.x === head.x && segment.y === head.y)) {
                
                gameOver();
                return;
            }

// 3. Move snake
            snake.unshift(head);

// 4. Check for food
            if (head.x === food.x && head.y === food.y) {
                score++;
                scoreDisplay.textContent = `Score: ${score}`;
                generateFood();
                // Speed up slightly (optional)
                clearInterval(gameLoopInterval);
                const newSpeed = INITIAL_SPEED - (score * 5);
                gameLoopInterval = setInterval(updateGame, Math.max(50, newSpeed));
            } else {
                // If no food, remove tail
                snake.pop();
            }

// 5. Redraw
            drawGame();
        }

function drawGame() {
            const cells = gameBoard.children;

// Clear board
            for (let i = 0; i < cells.length; i++) {
                cells[i].className = 'cell';
            }

// Draw snake
            snake.forEach(segment => {
                const index = getCellIndex(segment.x, segment.y);
                if (index >= 0 && index < cells.length) {
                    cells[index].classList.add('snake');
                }
            });

// Draw food
            const foodIndex = getCellIndex(food.x, food.y);
            if (foodIndex >= 0 && foodIndex < cells.length) {
                cells[foodIndex].classList.add('food');
            }
        }

// --- Input Handling ---

document.addEventListener('keydown', (e) => {
            if (isChangingDirection) return;

let newDir = { x: direction.x, y: direction.y };

switch (e.key) {
                case 'ArrowUp':
                    if (direction.y !== 1) newDir = { x: 0, y: -1 };
                    break;
                case 'ArrowDown':
                    if (direction.y !== -1) newDir = { x: 0, y: 1 };
                    break;
                case 'ArrowLeft':
                    if (direction.x !== 1) newDir = { x: -1, y: 0 };
                    break;
                case 'ArrowRight':
                    if (direction.x !== -1) newDir = { x: 1, y: 0 };
                    break;
                case 'r':
                case 'R':
                    if (!isRunning) location.reload(); // Simple restart
                    return;
                default:
                    return;
            }
            
            // Start the game immediately upon first directional input
            if (!isRunning && (newDir.x !== 0 || newDir.y !== 0)) {
                direction = newDir;
                startGame();
            } else if (isRunning) {
                direction = newDir;
                isChangingDirection = true;
            }
            e.preventDefault(); // Prevent scrolling
        });

// --- Initial Setup Call ---
        setupBoard();
        generateFood();
        drawGame(); // Draw initial snake/food before movement starts

</script>

</body>
</html>

CSS