A free app for Android, by Seventh rank.
The best way to train your brain is to do some simple math and solve some easy puzzles. This free app is the best way to do just that! It's a game that will challenge you with different math puzzles and help you improve your mental skills and memory.
The best thing about this app is that it's free and easy to play, so you can spend as much time as you want in the app.
The game is based on a simple concept:
You need to place the numbers 1 through 9 in a 9×9 grid.
Each number can only appear once in every 3×3 grid.
Each number must be placed only once in every row and column.
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