Sure! Here's a simple implementation of the classic Snake Game using JavaScript, enclosed in script tags in a single HTML file. This game is designed to be played on a smartphone and uses pictograms for visualization:
To play the game, save the above code in a file with a `.html` extension and open it in a web browser on your smartphone. The game board with cells will be displayed, and you can control the snake using touch gestures or through the arrow keys on your keyboard. The goal is to eat the red food (represented by the `food` class) with the green snake (represented by the `snake` class) without colliding with the borders or the snake's own body. When a collision occurs, a "Game Over" alert is displayed, and the game can be restarted.