Roller Game (Japanese: ローラーゲーム Hepburn: Rōrā Gēmu) was a variation of the sport of roller derby that was played in Japan by the Roller Game League, established in 1990. Roller Game was played on either a flat or banked track, and on either traditional (quad) roller skates or inline skates. Although its name is similar to that of the relatively theatrical Roller Games, Roller Game was, according to its promotional videos, inspired more by the original Roller Derby—it is a full-contact athletic competition with strictly enforced rules and no staged fighting. The game format in Roller Game, The jam starts with the 4-member defensive team entering the track and skating in a line. At the half-lap point, they are joined by 4 of the five members of the offensive team, who skate in a line beside them. The offensive team's jammer (identified with a solid white full-face motocross-style helmet) then enters after the two teams complete a lap together. Once the jammer enters, the pack can spread out around the track, and skaters can engage each other anywhere at any time, and most importantly, padded body armor and gear is mandatory for player's safety and protection in the game. The Jams cycle lasts 60 seconds, and Sets are used instead of periods, with the team winning the best 3 out of 5 sets winning the game. Unlike roller derby, where both teams have jammers on the track at the same time, Only one team takes turns plays offense at a time and can only have one jammer on the track at a time. Comparisons Among the unique features of Roller Game, which was played on a 100-m oval track: Only one team plays offense at a time – in Roller Derby, both teams have jammers on the track at the same time. Only one jammer on the track at a time – in Roller Derby, usually both teams have a jammer on the track at the same time. The jam starts with the 4-member defensive team entering the track and skating in a line. At the half-lap point, they are joined by 4 of the 5 members of the offensive team, who skate in a line beside them. The offensive team's jammer then enters after the two teams complete a lap together. Once the jammer enters, the pack can spread out around the track, and skaters can engage each other