Quantum Cube

Aigami, with the Quantum Cube

The Quantum Cube (量子キューブ Ryōshi Kyūbu) is a mystical object of great power used by Aigami in Yu-Gi-Oh! The Dark Side of Dimensions. It originally belonged to Shadi. Using the cube, Aigami can transport people to an alternate dimension, where they will gradually dissolve into nothingness or he can use it to erase people directly. It can also be transformed into a Duel Disk.

It appears to operate similar to KaibaCorp's virtual technology, as Seto Kaiba mocked his effort to disintegrate him with his own power and counteracted it. Kaiba later took possession of the Cube after Aigami's defeat, using it to enter the afterlife and duel Pharaoh Atem.