Rankk
Climb nine levels of programming, crypto and logic challenges
Rankk is a challenge site arranged as a pyramid of nine levels. You solve challenges in programming, mathematics, logic, cryptography, steganography and web security, and once you clear enough at one level you move up to the next.
Free · Login needed · Browser
About Rankk
It trains lateral thinking and the habit of writing small scripts to crack a puzzle. It suits players who enjoy mixed puzzle sites in the style of older hacking challenge sites.
It runs in the browser. Membership is free and you register to track progress.
On Breakpoint since 25 Oct 2026.
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Tips and discussion
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