Repeat squares

[Gazook89]

Every square is currently created without any knowledge of other squares, by random. So it can happen that many squares are the same. Might be fun...

But, could also try to set a limit of 2 or 3 matching squares.

Alternatively, allow the option of deleting a square and replacing it. To avoid cheating, add a visible counter to the square to show how many times it has been replaced.