I understand your request. Here is an example implementation of a game as a single HTML file with JavaScript and playable on mobile devices:
This is a simple tic-tac-toe game where two players take turns clicking on empty cells to try to get a line of three emojis in a row. The game board consists of nine yellow circles, and each player’s moves are displayed using their corresponding emojis (a smiling face and sunglasses). When a player wins, a congratulatory message is displayed in green text. The game should be fully playable on smartphones.