Summit rumbles or simply rumbling are "King of the Hill" style multiplayer-only events where you compete against opponents for points based on the amount of time you spend in the scoring zone and the number of opponents you knock out of the scoring zone. The max of participants are 8. Those events are held in special rumble tracks. In Summit rumbles, drivers score points based on the amount of time they spend on the Summit (and within the Summit Scoring Zones) during a session. For Summit Rumbles, points are awarded and taken away according to the following system: