A Japanese card game called Yu-Gi-Oh is being attacked by teachers and parents in Goi, western Brazil, for encouraging violent behavior in kids.

They claim the game, based on a comic series created by Kazuki Takahashi and which has become a worldwide hit, has promoted violence among children and teenagers and is even responsible for nightmares.

The game, marketed by Konami Computer Entertainment Japan, uses colored cards and features two players who face off in a battle consisting of three duels, featuring magic spells and traps to vanquish monsters.

At least two schools in the municipality have banned the game from their premises, alleging it has promoted lack of discipline and violence among students.