You awake from a terrifying nightmare to discover that your home city of River Lake has been devasted by an explosion at a neuroscience laboratory.
A dangerous biochemical has been released into the ecosystem, turning every living thing into a bloodthirsty killer. You are holed up in your apartment; for all you know you are the last survivor but your food and water supplies are running low.
It's time to take your chance and make your move. You must use your wits and your brain to avoid dangers, solve puzzles, find your girlfriend - if she is still alive - and escape the broken city...