Sure, here is a simple HTML game called "Zombie vs. Sniper Battle" implemented as a single HTML file using JavaScript. The game is playable on smartphones and uses pictograms for visual representation.
To play the game, open the HTML file in a web browser on your smartphone. When you tap the "Shoot" button, a random strength is assigned to both the zombie and the sniper. If the sniper's strength is higher, you win, and a success message is displayed. Otherwise, you lose, and a game over message is shown. To play again, tap the "Restart" button. The game uses pictograms for the zombie (`
🧟`) and the sniper (`
🎣`).