TriCubeA sticker variation of a Dayan Guhong (where the pieces itself are colored) which results in a puzzle with three solutions.
Troll CubeShowing all parities in the 3x3x3 super cube. A 3x3x3 which has the same number of permutations as the super 3x3x3 and is always solvable after arbitrary reassembling.
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.
Two-Faced CubeA 3x3x3 with stickers covered with lenticular lenses. Depending on the angle it might look solved but is not.
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.