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Dooz or Tic-Tac-Tao is a simple pen-and-paper game.
I created this implementation using Kotlin and Jetpack Compose for Android devices.

Jetpack Compose
Material3 and Dynamic Color


Variable game board grid size from three-by-three to nine-by-nine (Larger than nine-by-nine is simply ridiculous and unplayable in mobile phones)
Variable game ai difficulty (easy, medium, hard)

Simple Game

The Simple game is the most simple variation of Tic-tac-tao with a three-by-three grid with two players. The player who succeeds in placing three of their marks in horizontal, vertical, or diagonal is the winner.

Simple Game AI

Currently, in hard mode, AI uses a strategy rather than an AI search algorithm like MinMax. This strategy consists of these steps: Win, Block, Fork, Block Fork, Center Play, Corner Play, and Side Play.

Strategy's source: Flexible Strategy Use in Young Children's Tic-Tac-Toe by Kevin Crowley, Robert S. Siegler

In Easy difficulty, AI plays a random empty cell in the grid. In Medium difficulty, AI chooses between Easy difficulty and Hard difficulty for each move based on a 50/50 chance.


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 1.0.3 (4) suggested Added on 2023-02-03

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    • control vibration
      Allows the app to control the vibrator.

    Download APK 1.4 MiB PGP Signature | Build Log