 "Chains of Olympus" uses a proprietary, in-house engine referred to as the Ready at Dawn engine, which expanded on the engine created for their previous game, "Daxter" (2006).Originally designed for the PlayStation Portable's restricted 222 megahertz (MHz) processor, Ready at Dawn convinced Sony to increase the clock speed of the PSP to 333 MHz, which they did in a firmware upgrade.The faster processor allowed for more realistic blood effects, lighting effects, and shadows as well as improved enemy intelligence, but noticeably decreased battery life.