Darkness: The Portal Demo is the official Demo to an upcoming mod called Darkness. Darkness is about a multi-dimensional being who has gone to different video game worlds and caused havoc. The Half-Life/Portal universe is one which got attacked and it's up to you to put a stop to Darkness's plan to destroy all game worlds. In the final game you will see more games than just Portal, but the Demo only has part of the Portal chapter.
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