The Xbox 360 and PS3 versions of the Force Unleashed are the first games to use LucasArts' Ronin engine, which combines the Havok physics engine, Natural Motion's Euphoria AI, and Pixelux's Digital Molecular Matter (DMM), which allows enemies to react with fluid animation and self-preserving AI (such as grabbing on to ledges and dodging projectiles), and objects in the environment to bend, stretch and shatter based on their material properties. The versions for other versions simulate the effects, but do not actually include the modules.