If you encounter with any issue please contact me in email. (In windows store I can't reply on rating comment unfortunately) This type of TETROMINO game can help you to improve your vision in a pleasure way. You must play the game with 3D glasses you can't play without the glasses. Please read the following brief to get a picture about the purposes. - Lazy eye \Amblyopia is a visual disorder in which the brain partially or wholly ignores input from one eye. - The popular video game has been found to be effective at treating adult amblyopia, also known as 'lazy eye', according to new research conducted by scientists. - Playing the puzzle game requires information to be sent to both eyes, making them work cooperatively. - By making both eyes cooperate, the amblyopic brain is able to relearn as a result of an increase in the level of plasticity in the brain. (You must have a two color glass (3D glass) the color is not important because you can adjust the colors in the app as you wish) If you encounter any problem with the game please write me: email@example.com If you just leave a bad\good review on the app's page I can't reply that so I can't contact you to resolve the problem so please contact me in email if you have any problem I always can help Thanks a lot in advance!!