The Impossible Creatures Development Diary on PC.IGN.Com features some thoughts from Drew Dunlop, lead technical programmer on Relic's upcoming game of diving headfirst into the gene pool. He discusses the working of the "Combiner engine," the technology that allows for the game's namesake mix-and-match critters, going into the requirements they had for the technology, why they did things the way they did, the flexibility required to make the graphics succeed, how they feel the engine turned out, and more.