Sure, here's an example of a simple Snake game with a gun, implemented in a single HTML file. The game can be played on a smartphone and uses pictograms for visuals.
This HTML file contains the complete implementation of the Snake game with a gun. It uses JavaScript for game logic and is enclosed within `
` tags. To play the game, simply open the HTML file on a smartphone browser, and you can control the snake's direction using the arrow keys. The goal of the game is to eat the "gun" represented by a red square while avoiding collisions with the walls or the snake's body.