It's an all out war between two Japanese studios this week with SEGA filing a lawsuit against Level-5.
The makers of Sonic the Hedgehog, SEGA, claim that the folk behind Inazuma Eleven are infringing on a control patent on the Nintendo DS, where players move characters using a finger or stylus on the touch screen.
The report doesn't divulge what the specifics of the case are and why it differs from any other Nintendo DS or tablet game where players are controlled by touch. Likewise, the game(s) that SEGA have developed that use these mechanics have yet to become clear, but it's suggested that Football Manager could be a likely candidate.
If SEGA win the case, Level-5 maybe asked to stop the sale of the popular and highly lucrative Inazuma Eleven - which includes eight games - and ordered to pay ¥900 million ($11 million/£6.7 milion) in damages.