Blendoku

At first I thought it was really colorful and so I got the game. Then I realized it was probably like sudoku which I don't like. But I was like, "let's do it anyways." And I really like it. You have a cluster of squares and one color. And then you have shades of similar colors on top. You have to line the shades in order to pass the level. And so I thought maybe it was a trial type game. But it has like 400+ levels. And it starts to get quite hard too. It's a great challenge that seems simple but isn't.