DiPieA puzzle with two circles and a plunger which can exchange pieces between the circles. The circles are split in segments of four.
Differential CubeA 3x3x3 that allows only slice turns or anti-slice turns on the blue-green axis.
Digital CameraTwo 2x2x2s, a camera body and an objetive, together forming a camera.
Dino ReuleauxA tetrahedral Dino Cube which changes its shape with the first turn.
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