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Sumo is a custom play map originating in DRGunZ. It resembles a sumo ring, with a traversable border around the walls and Hell zones between the "ring" and the border. Hell begins at the same level as the ring, meaning any player knocked or flipped out of the ring will immediately die. There is a also a platform directly above the ring, which consists of two boards sloped in opposite directions.
Although this map is not suited to conventional matches, it is a popular choice for Berserker Deathmatches, as the constricted area allows for quick kills and easy EXP.