A Beauty Cold and Austere

I beta tested this game several times, and work with the author.

This is one of the best big games released in recent years. It's a mathematical puzzlefest, and it's huge; I'm a math professor, and I used the walkthrough, and it still took me 4 hours.

You travel through the history of mathematics, or more over a mind-map of theoretical concepts: the number line, arithmetic, algebra, all the way up to fractals.

The game is completable by non-math majors, according to several reviewers.

This is an old-school game; puzzles are unabashedly complex, each room is its own set-piece, NPCs don't engage in deep puzzle trees. I liked it, and I especially like that people are still making 'big games'.