The machine is not available outside Japan

Arm Spirit, which is distributed by Atlus, is to be removed from 150 game emporiums as "a precaution".

"We think that maybe some players get over-excited and twist their arms in an unnatural way," a spokesman said.

An investigation has been launched into the incidents and the machines are being checked for any malfunctions.

"The machine isn't that strong, much less so than a muscular man. Even women should be able to beat it," company spokesman Ayano Sakiyama told AP news agency.

Arm Spirit gamers advance through 10 levels, pitting their strength against a French maid, a drunken martial arts master and a Chihuahua dog before reaching the final challenge - a professional wrestler.