Online since 2002. The most comprehensive site for all around twisty puzzles.

Moving: Tiles
Farmland GearA puzzle with intersecting circles. Compared with similar circles this puzzle has additional gears inside the big square-like pieces.
Firebolt pillA cylinder with 4*8 tiles which can be moved in two completely different ways.
Five by FiveA custom made larger version of Tsukuda Square

Flip-SideTen tiles, one rotatable plane and two additional plungers.
ForamenCombines two intersecting circles with one plunger.
FormalhautTwo circles with different degree of rotation in a puzzle that is still doctrinaire.

Four by four - AnimalsAlternative versions of Tsukuda square with a several animals instead of coloured or numbered pieces.
Four by Four (spanish)Alternative version of the hard Tsukuda Square, made for the spanish market.
Fractal TwistFour intersecting circles with growing diameter. Turns of 180 are possible at any time.

GacruxTwo intersecting circles with eightfold turns but not in steps of 45. A jumbling-only puzzle.
Gamma (aka Colour Spectre)A soviet produced cousin of the Gripple. It comes with several differently coloured bodies.
GeraniumFive intersecting circles cut with fivefold symmetry imposing unprecedented theoretical challenges.

Geranium ButterflyA version of Geranium with six circles in a line-like pattern similar to the olympic rings.
Geranium EclipseA Pocket Geranium with an additional circle.
Geranium VA cousin to the original Geranium.

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