Spherium

Spherium (スフィアリウム Sufiariumu) is a sphere-type fighting game, invented by Yugi Mutou.

History
Four years after graduating high school, Yugi won a world game contest, entering Spherium. The game is given a high valuation and developed in collaboration with KaibaCorp. After completion of the Spherium II prototype, Yugi and Kaiba commenced their battle, playing the game in space.