A free program for Android, by Rikudo Games.

You will be solving logic problems, and the puzzles will keep getting harder. You will need to find a solution to each puzzle, and you can use the hints to help you. If you get stuck on a puzzle, you can use the notes to help you. The app is free and supported by ads.

The game is easy to play and can be enjoyed by people of all ages.

The rules to play the game are simple:

Each block of numbers must contain all the digits from 1 to the number of cells in a block.

Two numbers in neighboring cells must be different (including in the diagonal).

That’s it! Use these two simple rules and your logic to solve the puzzles.