Sure! Here's a simple game implemented in a single HTML file using JavaScript. The aim of the game is to match two identical triangles perfectly by moving one onto the other. It is optimized for smartphone operation and uses pictograms.
Triangle Matching Game
To play the game, save the code above into a `.html` file, and you can open it in a web browser to start the game. The game consists of two triangles represented by images. By tapping/clicking on the second triangle, it will animate and move horizontally to match the position of the first triangle. If the match is perfect, the second triangle will turn green, otherwise it will turn red.