Choose your mask pages and use it as a part of the game. Who will block the grids first? Invite a friend to play with. Try putting horizontally, vertically or diagonally - three masks side by side. Logical challenge is a great workout gor grey brain cells that already you can warm up to the red. Do your best and don't let anyone prevent you in this challenge. Buddy probably also counting on victory, but you show him that you are really tough opponent! Good luck!