Map your body onto a different universe's natural laws. See the impossible, and discover how to exploit that universe's natural laws for profit.New security officer Redding fought for years to get on a Portal team. A whole universe to explore, and she's babysitting tempermental, egotistical scientists arguing over a handful of dirt.But even a petty argument can escalate into a threat to the entire team.And a mere handful of dirt can threaten the Earth they've left behind...