SEQ, but that's all. The mechanics are radically different, and appear to be completely original.
The play area is a board containing some grey and colored squares. Your goal is to remove all the colored squares; you do so by tapping on the grey squares.
So in the example above, tapping the grey square at the top would remove the two yellow squares. Tapping the one at the bottom would remove two of the red squares.
But note that there are three red squares in this puzzle, so if you remove two of them you will never be able to remove the single one left. To solve the puzzle, you need to remove all three red squares at the same time.
You can remove two pairs of differently colored squares with a single move. For example, in this puzzle if you tap on the grey square on the second row you will remove two yellow and two red squares. Again, this would be a wrong move because you'd leave a single red square.
There are other ways to get stuck. For example in this puzzle
Logic helps a lot in finding a solution to the puzzles. While some amount of trial and error is probably needed, as it often happens in this kind of games it's useful to think backwards: "I can't remove these pieces until I remove this one, but to remove this one I first need to remove this other one..." From this you get a rough order of removal and just need to fill in the gaps.
If you make a mistake there's an undo button but not a restart button, so to get back to the beginning you need to tap undo multiple times. This is a bit odd but I guess it's ok since you can't make that many moves, even in the larger puzzles.
The game currently contains 120 puzzles, split across 6 worlds of 20 puzzles each. The first 9 puzzles of world A act as a very well thought out tutorial, which seamlessly introduces the rules of the game.
The first two worlds are free, the others can be unlocked through separated in-app purchases, or with a single one to unlock all worlds at a discount.
The puzzles get larger as the worlds progress, with the largest ones being 8x8:
Very annoyingly, even buying all the worlds doesn't remove the ad banners. This is my number one complaint.
Also, it looks like color blindness hasn't bee taken into account. For example here is a simulation of how a person with protanopia would see the diamond shaped puzzle above:
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