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

Intersecting circles
Weird Disk 4x4Two intersecting circles rotating with 90° but with different sizes.
Weird Disk 5x7A puzzle designed to stay in the middle between Weird Disk 4x12 and Weird Disk 6x6.
Weird Disk 6x6Two intersecting circles which rotate by steps of 60°.

Whirligig Plate 5 CirclesThe version with five circles.
Whirligig Plate 9 CirclesNine circles version. Apart from the basic solution, there are other patterns that can be made with the colours.

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