Half Hour Cube | Stewart Coffin 1975 Wooden 3x3x3 Puzzle homeschool 9 rings requires 511 moves

9 rings requires 511 moves

Anyone who does not know it has a real little puzzle on their hands

and objects

This modern adaptation brings a timeless challenge to today’s puzzle lovers

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Half Hour Cube | Stewart Coffin 1975 Wooden 3x3x3 Puzzle homeschool 9 rings requires 511 movesHalf Hour Cube is a handcrafted wooden 3x3x3 cube brain teaser designed by Stewart Coffin in 1975. Coffin estimated a half hour as a good solution time. It looks like a Soma Cube, but where Soma has 240 valid solutions, this has only one. Each puzzle is handcrafted from precision cut hardwoods by Creative Crafthouse with Stewart Coffin's permission. Includes a base and cover for display and travel. 3x3x3 cube format. One solution only. Ships unsolved.