Rival Mark Duel

Rival Mark Duel is a two-player Tic Tac Toe game designed for quick matches between friends or family on a single device.

The game is played on a classic 3x3 grid. Players alternate placing X and O marks until one of them lands three in a row — horizontally, vertically, or diagonally. A win triggers a celebratory animation to mark the moment. Draws are detected automatically when the board fills with no winner.

Everything runs locally with no accounts, no internet connection, and no hidden costs. Just open the app and start playing.

The interface is clean and distraction-free, with support for light, dark, and system themes. Font size can be adjusted in settings, and you can choose which tab the app opens on by default.