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World 4 · Towers of Hanoi and Recursion · 8 min · PRO

Three pegs, one rule: the puzzle

Move the whole tower, one disc at a time

PRO · Puzzle Algorithms Lab

World 4: Towers of Hanoi and Recursion is part of PRO

The first world of Puzzle Algorithms Lab is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • Recursion: solving a problem by solving a smaller one
  • Two to the n, minus one: counting the moves
  • The legend of 64 discs: when exponential means impossible
  • Shortest path on a grid: from BFS to weights
  • Dijkstra: always expand the cheapest
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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← How computers solve it: a two-phase ideaRecursion: solving a problem by solving a smaller one →

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