World 3 · God’s Number · 11 min · PRO
Twenty moves: the God’s number story
The hardest cube in the world needs only 20 moves
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.
PRO includes
- All 60 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly