Level-5, perhaps best known in the western world as the publisher of the Professor Layton games, has a popular soccer series in Japan called Inazuma Eleven, and Sega doesn't like it. Sega is suing Level-5, alleging patent infringement on a mechanic in Nintendo DS versions of Inazuma Eleven that allows players to move characters with their fingers or a stylus, Kotaku reports.

Sega's endgame is to halt the sale of all eight Inazuma Eleven games and to get ¥900 million ($11 million) in damages from Level-5. The case heard opening statements on December 7, and Level-5 plans to fight the charges.

"We are preparing our rebuttal and do not have any comments to make at this time," Level-5 says.