Jane Street Puzzles

What Jane Street Puzzles actually is

A trading firm posts a single problem each month, usually combinatorial or geometric, and gives you until the end of the month to submit an answer. Past puzzles stay online with full worked solutions, so the archive doubles as a long course in this style of thinking.

Why it is worth your time

The published solutions explain the elegant route rather than only the answer, which is exactly where most puzzle archives stop.

Common questions

Is Jane Street Puzzles free?

Yes. Jane Street Puzzles is free and does not ask you to register or hand over an email address before you can use it.

How long does Jane Street Puzzles take?

Clear your evening. We warned you. We file it under "Rabbit hole" — one properly hard maths puzzle, every single month.

Does Jane Street Puzzles work on a phone?

Jane Street Puzzles really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.

What kind of site is Jane Street Puzzles?

We list it under Mind Benders — one more round, then bed. definitely. The published solutions explain the elegant route rather than only the answer, which is exactly where most puzzle archives stop.