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Twisting Puzzles
Gear Cube Extreme
The Gear Cube Extreme is a more challenging variant of the Gear Cube, invented by Oskar van Deventer and originally sold and manufactured by Uwe Meffert. The puzzle adds a little more cog work to make the puzzle significantly harder than the Gear Cube, which is a reasonably straightforward puzzle.
The puzzle is really nice to turn but difficult to solve. Each turn makes changes to the overall state of the puzzle that are quite confusing to track at first. It's a nice puzzle to have in the collection and to take out when you want to spend some time thinking hard about a puzzle.