Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

1991
Challenge Cube FourThe little brother of Challenge Cube Nine from the same company. It depicts six different fruits.
Challenge Cube NineSliding block puzzle with playing card suits.
Gerdig UFOSpin the top/bottom half to mix the satellites, then use the central plunger to flip one, two, three or four satellites over.

MastermorphixA higher-order Pyramorphix. A 3x3x3 transformed into the shape of a tetrahedron.
Rubik's Royal Brain Teaser441 piece jigsaw puzzle.
Skewb DiamondMeffert's build-up and truncation of a Skewb into an octahedron.

Tetrahedron (Halpern-Meier-Tetrahedron)Another custom Skewb mod by Tony Fisher with a complicated history.

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