Rule 1: The game is played on a 3x3 grid.
Rule 2: Two players take turns placing their marks, either "X" or "O", in the empty spaces.
Rule 3: The goal is to get three of your marks in a row.
Rule 4: The row can be horizontal, vertical, or diagonal.
Rule 5: If all nine spaces are filled and neither player has three marks in a row, the game is a draw.

Action: Click on the empty space you want to place your mark.
Action: Tap on the empty space you want to place your mark on a mobile device.
Action: Use the "X" and "O" buttons to switch between players.

Yes, you can choose to play against the computer in single-player mode.

Yes, you can play against a friend in multiplayer mode.

Yes, Tic Tac Toe is playable on both desktop and mobile devices.