Khalou comes from Aurelien Wenger. The object is to turn all the stones white. To do this, you may reverse the color by swiping a row. Or a column. Or a square 2x2 group.
Khalou is challenging. Hey, it's a free puzzle app game. Give it a try.
The instructions are in French though.
Don't forget that you can also swipe a main diagonal. I think this is sometimes needed to solve a puzzle in the required 5 moves.
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