Pythagorea is a weird Android (perhaps also iOs) game about geometry, where you have to make semi-Euclidean constructions: you have an unmarked ruler but not a compass, and you're limited to a finite space, but you do get grid points and lines for free. Some puzzles are tedious, but I like it overall. And the constructions can get involved. (I'm still unsure why the inner circle of the 3-4-5 Pythagorean triangle had radius 1.)
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