Brain-chekA puzzle with a unique mechanism that came in at least four different versions.
BrainballSpin the number ring, and twist the ends to flip seven of the thirteen numbers over.
Brainstring AdvancedAn improved design and an additional set of strings set this version apart from the original.
BramboulesInspired by CMetrick this puzzle pushes that concept to a new level.
CerberusSix telescopic rods have to be arranged into a pentagram.
ChronosA puzzle which is based on the fourth dimensional symmetry (edge-transitivity) of the 4D polytope 5-cell (also known as Pentachoron)
Clock 4x4Rubiks Clock scaled up to greater size.
ColossusA puzzle which is based on the fourth dimensional symmetry (edge-transitivity) of the 4D polytope 24-cell (also known as Icositetrachoron).
CosmosThis puzzle pretends to be based on a 4D polytope but it is not. Instead it is a cube with its antipodes connected.
Crazy Elephant DanceA generalized version of Elephant Spin-Out. All elephants allows three different states instead of two.
Elephant OutA colourful version of Spin Out, but in a smaller size and the knobs are decorated with elephants.
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