Project Euler

Amit Patel's interactive tutorials on pathfinding, map generation, and game algorithms.

Interactive explorable explanations of complex topics. Game theory, anxiety, social networks visualized.

Interactive mathematics miscellany. Hundreds of puzzles, proofs, and explorations.

Learn cryptography by breaking it. Programming challenges teaching crypto.

Interactive explorations of complex systems. Emergence, chaos, networks - play with the math.

Free education for anyone, anywhere. Math, science, computing, and more with personalized learning.