Penumbra is a singleplayer Half-Life modification. You will journey yourself through new facilities, puzzles, enemies, and be introduced to new weapons/items! The story begins when you are tipped off to the location of a precious jem. You are a professional thief working with 2 others in your group for personal gain. You reach the location in your hiest van and trek into the run-down building to claim your prize. All is going well until the setup...

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