Tic Tac Toe IO is an online multiplayer version of the classic Tic Tac Toe (X and O) puzzle board game. Players choose to play on grid sizes ranging from 3×3 to 21×21 across three difficulty levels—easy, medium, or hard. Compete against a CPU opponent, challenge a friend on the same device, or face off against an online player to be the first to connect 3 or 5 in a row to claim victory.
Tic Tac Toe.io has 3 game modes: Online, Two Players, and Vs Computer. Pick one and jump straight to the quick match, aiming to be the first to get a straight line of your symbol (X or O) on the grid. This line can be horizontal, vertical, or diagonal.
Depending on the setting option you select, it can be 3 in a row on a 3x3 grid or 5 in a row on larger grids like 9x9, 15x15, or 21x21 to win. As the game starts, you and the opponent take turns placing X or O in an empty square. The game ends when a player forms the required line and claims victory or when the board fills up with no winner found.
Overall, Tic Tac Toe IO delivers all the thrills you want in an IO game: fast-paced, strategic, and endlessly replayable. Jump in, enjoy quick 3×3 matches, or dive into tactical 21×21 challenges, and aim to be the first to complete the required line to claim victory.