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World 3 · God’s Number · 11 min · PRO

How many positions? A number bigger than you can count

The multiplication principle and factorials

PRO · Puzzle Algorithms Lab

World 3: God’s Number 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.

  • Why you cannot twist one corner: hidden rules
  • Twenty moves: the God’s number story
  • How computers solve it: a two-phase idea
  • Three pegs, one rule: the puzzle
  • Recursion: solving a problem by solving a smaller one
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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← Count and check: how many moves is that?Why you cannot twist one corner: hidden rules →

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