The user interface is very well done and uses swipes to turn the cubes. An excellent detail is that you can move the cubes just a little, to see what's on the side faces, without actually making a move. You can do that also to see what's on the back face, but that's not needed because the back face is the same as the front face, except that one is white and the other is red. The solved state uses only the white faces.
The update which has just been released adds an introductory 2x1 puzzle, which is much simpler to solve:
As I said at the beginning of the review, the initial version of the game lacked a purpose: it just showed a counter of the number of moves made, without any objective to meet.
This is fixed now because a "belt" grading system has been added:
I don't know what the theoretical maximums are; it looks like the optimal solution usually requires 5-6 moves for the 2x1 puzzle and 8-10 moves for the 2x2 puzzle. This should mean that earning the black belt in 2x1 shouldn't be too difficult, while for 2x2 it will be a lot harder.
Well done to Grifia for implementing such a slick interface and for recognizing the shortcomings of their initial release and quickly addressing them.
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