Simple 2000 Series Ultimate Vol. 17: Taisen! Bakudan Poi Poi (2004)

Taisen Bakudan Poi Poi: Sometime in the year 20XX, a super computer goes awry and ordinary citizens are recruited into a virtual world where everyone hefts massive bombs. Once hefted, bombs may be hurled at opponents in a frenetic blast 'em up. Run around the digital landscape, gather a bomb and then time your attacks against roving combatants while being pursued by other bomb toting miscreants.