Einstein™ Enigma (yes, "Einstein" is a trademark) by the German BBG Entertainment is an old style sliding puzzle with a couple of new twists.
Enigma machine, but don't believe that marketing fluff: it has nothing to do with that.
The basic idea is similar to physical puzzles like Circle Puzzle (which is much easier) or to other apps like Rynglets, but with a more intuitive user interface and a few novel mechanics that make it more varied.
The play area consists of 6 intersecting rings which can be rotated by multiples of 90 degrees. When you rotate a ring you turn not only the 4 arcs that form its perimeter, but also the 4 additional arcs inside, which are part of the perimeter of the neighboring rings.
At the center of the rings you can see your goal: the colors of each ring must match the goal.
Each puzzle can be played at four levels of difficulty, which basically is simply the amount of scrambling applied. The easy difficulty is just one move away from the solved state, and that single move is even shown to you at the beginning! Frankly you'd better just play the hard versions right away. You'll need to anyway, in order to earn stars and unlock the later puzzles.
If you are familiar with commutators solving these puzzles shouldn't be too difficult, but the additional gameplay elements introduced in later packs do make a difference and will require you to carefully think about the consequences of your moves.
First you get to play with cogwheels, which link the movement of multiple rings:
A nasty bug must have escaped QA testing, because a couple of the puzzles in the last pack seem to contain nonsensical gibberish, like this one:
I liked the variety of the puzzles included in this game, but I could have done without the churning needed to unlock them all. Still, if you like this kind of rearrangement puzzles, this can be a worthy addition to your library.
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