Sure, here's an example of a simple "Snack Match" game implemented in a single HTML file using JavaScript and enclosed in script tags:
Snack Match
You can copy and paste this code into a blank HTML file and open it in a web browser on your smartphone to play the "Snack Match" game. The game consists of a grid of cards, each displaying a pictogram of a snack. The objective is to find and match all pairs of snack cards by flipping them over two at a time. Once all pairs are matched, the game will display a "Congratulations! You won the game!" message and allow you to start a new game by clicking "OK".