Sure! Here's an example of a simple 3D zombie game implemented as a single HTML file. The game uses JavaScript and can be played on a smartphone. It incorporates pictograms for visual elements.
To play the game, simply open the HTML file on a smartphone browser. The player (represented by a red square) can be controlled by touching and moving the screen. The zombies (represented by green squares) will move towards the player, and if a zombie collides with the player, a game over alert will be displayed.