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World 2 · Solve It Layer by Layer · 10 min · PRO

First-layer corners: one at a time

The four-move trick R' D' R D

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.

  • The white cross: start with a plan
  • 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
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  • Practice exams and certificates

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← The white cross: start with a planSecond-layer edges: insert from above →

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