weapons and vehicles, such as those found in the Ratchet and Clank series, with its proprietary development engine and physics system to create unique human and Chimeran weaponry. Each weapon provides a unique play style and strategy. An example of this is found with the Auger (Chimeran). The primary fire for this weapon is simple rapid fire, but the bullets burrow through walls, actually coming out stronger on the other side, opening up a whole new level of strategy. The secondary fire creates a barrier that is resistant to all bullets but its own. In addition to the usual short- and long-range weapons, the game features several different types of grenades, with both historical and futuristic varieties. For example, one grenade, known as the Backlash grenade, is capable of creating a dome-shaped barrier, where the player can enter for cover. The barrier reflects shots from opposing Chimera. Some weapons are not available on the first play-through of the game but can be found at certain locations on replaying the game. The game features melee attacks, and the motion sensing feature of the SIXAXIS controller is used for a number of things including shaking off enemies that grab onto the player, shaking off tags and flames in multiplayer, and quickly bringing up a map or leaderboard in a multiplayer match. The player also has access to turrets and a drivable jeep with a gun turret on certain levels. The game was also on Sony's list of titles to receive an online update to support the vibration feature of the DualShock 3 controller for Japan, North America, and Europe. There are also skill points that can be earned throughout the single player game. These are awarded for certain actions that are hinted at by their titles; however, the specific details are not revealed until the skill point is actually earned. There are generic skill points that can be earned during any single level, and some that are specific to certain levels of the game. Each task is worth a different number of points which are used to unlock additional media for the game. The requirements for the skill points are not told to the player until unlocked making it more difficult to achieve these points In addition, multiple Intel documents can be found scattered throughout each level. These give the player an insight into what has happened, is happening, and will happen.