Flip-Flop: When you see Flip-Flop for the first time, your initial thought is inevitably the same: a game that looks that simple surely cannot be of any difficulty to solve.

When you've played Flip-Flop for several minutes, your impression is the same again: it is impossible! You may wonder, what is the trick?

Your task is so easy that it seems a child could do it. Open all the sixteen windows placed in a four-by-four square grid. That's all. However, achieving this elementary goal can take hours. Many hours, until you master the little secret of the game. You may end up finding your friends lured into Flip-Flop as well. Imagine their surprised faces when you leave them much behind you! It's simple as now you know the trick!