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Hape
Twiddler - Double DilemmaTwo intersecting circles. Comes with an additional pieces to determine the solved configuration.
Twiddler - Quad-RadicalFour intersecting circles. Comes with an additional pieces to determine the solved configuration.
Twiddler - Tri-PlexedThree intersecting circles. Comes with an additional pieces to determine the solved configuration.

Twiddler - Triple TemptationThree intersecting circles. Comes with additional pieces to determine the solved configuration.

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