Cluster Bomb is a medal kickback available in Uncharted 3: Drake's Deception multiplayer. When activated, it causes a single grenade to change into multiple grenades when thrown, which then spread out around the general area in the direction that the initial grenade was directed. Grenades that are the result of this kickback have blue indicators, rather than red like the standard grenades. It costs 10 medals to activate, and is unlocked when rank 43 is reached. This can be used in both competitive and co-op.