At the time of writing, there's a promotion going on: by tapping a button on the developer's website, you can unlock all available levels for free.
One novelty when compared to similar puzzles is that instead of reconstructing a picture, you have to connect coloured "switches" on the sides of the board, using tiles of the same colour.
Early on, another puzzle element is introduced: black tiles, which cannot wrap around from the sides of the board, therefore limiting movement possibilities.
Other elements introduced later include tiles larger than 1x1, which cause multiple rows/columns to scroll at the same time, and must not be split by wrapping around the sides of the board.
The puzzles in this game can be hard, however my feeling is that they are more tedious than difficult. The boards are often unnecessarily large, as some of the screenshots in this review illustrate. Solving such puzzles surely requires patience and a lot of mechanical repetition, but the need for intuition is too diluted to make me find them interesting.
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