Portal: Outside Influence

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Portal: Outside Influence
Portal Outside Influence Splash.png
Basic Information

Elite Treacle Ltd.


Source Engine






First-person puzzle/platformer

The war is over. Mankind lost. Scattered and spread across the planet, the survivors search for refuge in the ruins of the old world. One of these stragglers stumbled across something that hasn't been seen by outside eyes for a long time...

Portal: Outside Influence is a commercial Portal modification, containing elements from Half-Life and System Shock. It will be released on Steam and makes use of a custom build of the Source Engine.

The mod includes new testing elements, environments, music and voice lines. The mod has been designed by Sam Morris, who also designed the Portal map Portal: Skyline.

The music has been composed by several composers like NxSG, Alphadeus and Egill And. The story was written by Sam Morris and Emilia Wake.