THEY BOTH USE QUAKE ENGINES!!
No dumbass, Half Life used the heavily modified Quake engine, and Dues Ex used the Unreal engine. Methinks you were to busy mastrubating to know the difference.
Edit - All4naught replied already. But my reply was better
This comment was edited on May 28, 14:40.
You cannot make anything fool-proof. The fools are too inventive
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