FlipFlop description

What is the game?
The game exists rather long. The conception of FlipFlop is very simple. You have to press circles in order to change them color in the row and the column.
Your goal:
To get only green circles on the game field. How to do it you could understand. Start game from 4x4 field size and try to win!
The game has few levels of the difficulty. 4x4, 6x6, 8x8 and 10x10 (LEGENDARY DIFFICULTY)
It's a game for resting while you wait...