Sure, here's a simple implementation of a 3D sniper game using JavaScript and HTML within a single HTML file. Since it's a text-based game, I won't be able to include pictograms, but the game can be played on a smartphone.
The game starts with a score of 0 and 10 bullets. The player can click on the "Shoot" button which calls the `shoot` function. The function randomly determines if the shot hits the target or misses. The score and number of bullets left are displayed in the UI.
This is a simplified version of a 3D sniper game, but you can expand on it by adding more features, graphics, levels, etc., depending on what you envision for your game.