Tsukuda Rubik's Cube IIA later edition of Rubik's Cube. Sold by Japanese company Tsukuda Original under license of Seven Towns.
Tunnel CubeThe Handlebar Cube implemented differently. It allows more moves than the predecessor.
Turbull TartanA custom made sticker variation inspired by the tartan cube.
Unproportional CubeMechanical engineering exercise to defy seemingly obvious rules of puzzle making.
Variomatic CubeIt looks like Gear Cube but implements an ingenious twisting method which can't be explained in one sentence.
Void CubeA 3x3x3 with a hole through the center.
Void String V1A Void Cube with uniform stickers but strings attached to the edges.
Void String V2A follow-up of Void String V1 with non-uniform stickers and colored strings.
Void String V3A follow-up of Void String V1 with the original objective: Disentangle the strings.