Flashbike Arena is a UDK iPhone and iPad game which features the next generation mobile graphics of Unreal Engine 3 including next generation shaders and rigid body physics. The game itself is a third person arcade style racing battle where you ride a futuristic motorbike that leaves a colored wall in its wake. Causing other players to crash into your wall or their own earns points. Additional points and multipliers can be earned by collecting the “energy cores” left behind as the wreckage of a fallen adversary. These energy cores are how the bikes get their power and generate their walls!
When an opponent crashes a rigid body orb is generated where they crashed. This is meant to be the "core" of their bike, the glowing bit in the middle that powers it. You can earn points by collecting these cores, but their main benefit is that by collecting them before they disappear you can earn a multiplier up to 8x that applies to all other points earned in the game.