Lifle

Each day, Lifle shows you 2-5 research-grade photos and a range map of a real organism – a moss, a butterfly, a fish, an obscure deep-sea worm. Your job is to identify or place the organism on the biological tree of life. Every guess is graded against the true taxonomy, with subtle hints about how close you got.

Five guesses. Seven ranks. One puzzle a day. Resets at midnight Pacific.

Designed for naturalists, biology students, and anyone who's ever wondered why the platypus gets its own corner of the tree.