There's an advantage to using Playstation 3 instead of Xbox 360 for this time attack in particular. Due to the difference in how things load in on the PS3 version compared to 360 (worse draw distance), the spiked balls on the roof next to the 4 robots fall down on their own. The way they fall is based on how they are spawned in, which varies based off of your distance away from each of the spawns (which is camera dependent). With favorable spawns it's possible for some of the robots to be defeated without you having to damage them directly with Amy, which saves seconds on PS3 over 360. Enjoy! ^_^
Twitch: / darkspinessonic
Twitter: / darkspinessonic