From the back of the box:
Make yourself disappear for a moment.
Make your enemy disappear forever.
"In the wake of massive air pollution and economic disaster in Tokyo, Japan has relocated its capital. Old Tokyo has become the battleground for a new breed of public entertainment called Rumbling. Observing from a massive airborne viewing station, spectators watch Scoobees battle to the death. More than just high-speed, heavily armed Mechs, Scoobees have an unprecedented stealth capability - turning invisible at will for brief periods of time. The stakes are high. The enemies are ruthless. The action is intense. Are you ready to rumble?"