This is what educational games should be: genuinely teaching real mathematical concepts while being engaging enough that kids (and adults) willingly spend hours on it.

Euclidea doesn't dumb down Euclidean geometry—it makes it tactile and exploratory. You're literally doing the same compass-and-straightedge constructions that ancient Greek mathematicians did, but with instant feedback and the ability to drag points around to understand why your proof works (or doesn't). The scoring system (fewest lines vs. fewest elementary constructions) teaches that there are multiple ways to approach problems and that elegance matters in mathematics.

The difficulty curve is real. Early levels guide you gently, but by the time you're constructing regular pentagons or finding outer tangents, you're doing legitimate geometry that would appear in a high school honors course. Some kids will love this challenge; others will rage-quit. The IAP to unlock all levels is actually reasonable here—it removes the grind without adding pay-to-win nonsense.

If your kid likes math, logic puzzles, or games like Monument Valley, this is a no-brainer. If they tolerate math class but don't seek it out for fun, they'll probably find this tedious. Know your audience.