Sure! Here's a simple game called "Merge Game" implemented as a single HTML file using JavaScript. The game is designed to be played on a smartphone and uses pictograms for the game elements.
Merge Game
In the game, there are four blocks with different pictograms representing fruits (grapes, watermelon, strawberry, and banana). The objective is to merge the blocks together by clicking on the filled ones. When two adjacent blocks with pictograms are clicked, they will merge together into a single block with the combined pictograms. Each merged block increases the score. The game can be played on a smartphone by tapping on the blocks.
Note: To play the game, you can copy and paste the above code into a new HTML file and open it in a web browser on your smartphone.