'Almost Unsolvable' puzzle game 

When you click on any tile, it and all its nearest neighbors flip and change color.

To shuffle the tiles randomly, click on the third button from the left.

You can also shuffle the tiles by repeatedly clicking on the center button or simply by randomly tapping on the tiles.

Once the tiles are shuffled, try to return them to their original state.

By clicking on the third button from the right, you can restart the game.

The plus and minus buttons change the size of the playing field. 

When the field size is changed, it returns to its original state.

If you press the right button once, the tiles will show their serial numbers. 

Pressing the same button again will show circles on the buttons that you need to press to win. 

Pressing the button a third time will remove all information from the tiles.

You can, by clicking on several tiles, bring the game board to a certain state, and then invite your followers on social networks to try to bring the game to this state. 

Here is an example riddle: by clicking on 4 tiles, make the game board look like this:

Answer: you need to click on the tiles numbered 9, 16, 20 and 21.

Other apps ➡

If you like this app, please help other people find it by rating it and writing a few words in the review.