At first, it looks like just another sliding tile puzzle,
The goal is to merge all pieces of the same color.
So in the puzzle above, if you move the green tile left you get into this position,
The game contains 119 levels. The first three are 3x3, all the others are 4x4.
Puzzle #4 is pretty difficult already.
There's support for undo, but only of the last move, so to try different strategies you always have to restart from the beginning.
If you get stuck on a puzzle—and I guarantee that you will—there's a built-in hint system that allows to see a solved position (which is not necessarily the only one). Finding the moves to get there is still up to you, but knowing where the tiles need to go is a huge help.
The hint system is locked at the beginning and can be unlocked with a single in-app purchase. Once purchased, you can use it without limits. So be careful not to spoil the fun.
The user interface in this initial release is a bit rough and sluggish, detracting somewhat from the enjoyment of the game. For example, the movement of tiles while you drag them is a bit choppy.
The most serious shortcoming, however, is the puzzle selection list: you have to scroll puzzles one by one, with no trace of inertial scrolling, and they scroll horizontally instead of vertically. It works very differently from the standard iOS controls.
Lazors or Subaku.
The color scheme could also be improved for color blind people, here is the customary simulation of protanopia:
This game is highly recommended for its novel mechanics and frustrating difficulty. I hope the user interface will be significantly improved in future updates.
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