Sure, here's a simple implementation of a Tic-Tac-Toe game as a single HTML file:
Tic-Tac-Toe
This HTML file includes the necessary script tags and contains JavaScript code within those tags. The game is playable on a smartphone as it uses clickable div elements as the game board cells. The game logic checks for a winner after each move and alerts the result accordingly. The game can be reset by calling the `resetGame()` function.