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Twenty kinds of puzzle across more than 255 levels, arranged so the early ones teach you the mechanic and the later ones assume you've learned it.
The mix is broad. Some are original; others are worked-over versions of puzzles that have been around for generations, including strong takes on Fifteen and Reversi. What they have in common is that none of them can be brute-forced comfortably — the levels were laid out to reward working the problem rather than tapping at it.
Graphics stay clean, and the music and sound design were written for the game rather than licensed off a shelf. It holds up for children and adults for the same reason: the difficulty curve is real, and it doesn't stop.
