3y3.net wish to say thank you to the customers. Now this app for is for free.
Go, get it!!
Fiver is a math game where the goal is to convert all white pieces into black.
When you tap a piece it will change from white to black and vice-versa, and it will also change the pieces above, bellow and to the left and right of the taped piece.
There are six differents board sizes (3x3, 4x4, 5x5, 6x6, 7x7 and 8x8) and three differents initials distributions (Standard, Checkered and Lines) to get up to 18 differents game experiences and hours of fun.