Sure! Here's a simple implementation of a 3D cheez-it platformer game in a single HTML file using JavaScript:
This implementation creates a simple cheez-it platformer game where the player must avoid falling off the screen by jumping using touch controls. The cheez-it character is represented by a yellow square, and the game is played on a black canvas. When the player hits the ground, a "Game Over!" alert is shown, and the game resets.