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World 2 · Solve It Layer by Layer · 9 min · PRO

The white cross: start with a plan

Four edges, matched to the centres

PRO · Puzzle Algorithms Lab

World 2: Solve It Layer by Layer 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.

  • First-layer corners: one at a time
  • Second-layer edges: insert from above
  • The last layer: cross, orient, permute
  • Count and check: how many moves is that?
  • How many positions? A number bigger than you can count
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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← A warm-up on 2×2: a smaller cube, the same ideasFirst-layer corners: one at a time →

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