Cryptopals
Crypto challenges that teach you how ciphers break by making you break them yourself.
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- cryptopals.com
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Websites like Cryptopals
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OverTheWire
Security wargames played over SSH, starting from absolute beginner. The classic on-ramp.
- Learn
- Free
- overthewire.org
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Electude Simulator Challenge
Diagnose a broken engine with a virtual multimeter and wiring diagrams, the way trainee mechanics do. Scored against the clock.
- Learn
- Free
- simulator.electude.com
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Hacksplaining
Short interactive lessons where you carry out real attacks like SQL injection and XSS yourself, then learn how to defend against them.
- Learn
- Free
- hacksplaining.com
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Project Euler
Hundreds of maths problems you can only solve with code, where the brute-force answer takes a week and the clever one takes a second.
- Learn
- Free
- projecteuler.net
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Advent of Code
A December calendar of programming puzzles with a story, a leaderboard and a devoted community.
- Learn
- Free
- adventofcode.com
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Magnitudle
Daily estimation games: guess how big, how far or how many, and see how close your gut feeling gets to the real number.
- Games & Play
- Free
- magnitudle.com
