Sky Scramble, one (in this humble reviewer's opinion) of the top 10 games of 2013, was recently updated with major changes.
In my original review, I pointed out how the level order was very unconventional: instead of a simple progress from easy to hard puzzles, you'd get groups of three puzzles with the same topology, but increasing difficulty:
Now the puzzles are simply split in 6 packs of 30 puzzles each. The first one is free, the others can be unlocked individually through in-app purchases, or you can unlock all of them with a single purchase. If you upgrade from a previous version, some of the packs will be already unlocked.
Finally, a small but significant change which I like is that if you track back your moves while solving a puzzle, it is as if you had tapped the undo button, so the move count decreases and the recorded solution (which you can play back after solving the puzzle) will not contain the redundant moves. This makes it easier to get decent star ratings without having to use the undo button every time you make a mistake, so the experience is smoother and more satisfying.
Overall, this is an excellent update; if you had put the game aside, it's worth looking at it again.
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