Portal told the story of what was left of Aperture Science. Valve has assured that there is more Portal coming, but in the mean time the fans continue to create awesome content. Portal: Prelude is a fan made map pack that aims to tell the story of what happened before GLaDOS arrived. If you had a chance to checkout the Flash Map Pack, you have a rough idea on what to expect. New Test Chambers, which means more crazy challenges to conquer. This one stands out from the rest though, as it’s telling an original story. The game is looking great based on the trailer. It will be available to download in the coming months. Stay tuned to Buttonbasher as I definitely post about it when it releases.
For more info on Portal: Prelude check out the official site