Has anyone ever played Prey?
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If so, recall the use of teleporters that took the player to seemingly new terrains, planets or small moons even, only to find that you'd been teleported inside of a container that you'd passed by only moments before and are fighting, in some micronized form, on the surface of a rock sample that you'd seen earlier, suspended within. The only reason you finally know where you are once the disorientation following teleportation settles was because when you trigger a button inside that environment, an alarm goes off and you see what appears to be a GIGANTIC version of an enemy warrior run up and look into the now obvious container you are in, spotting you, and transports himself into the box to do battle.
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That was by far the most clever and interesting use of in-game mechanics and visual/environmental trickery I've ever encountered in a game - all done on the Doom3 engine. I'm willing to bet the HL2 engine can handle similarly clever ideas.
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