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Trivia: At the end of the Aztec level when the space shuttle takes off, you can tell exactly what they did for the fire effects of the engines. Normal shuttles would have a column of fire blasting down from each engine and have an ear shattering roar. But in this game, only the ends of the engines burst into fire several times rapidly as it goes up and the sound is just a single explosive sound on repeat. To get the effect, the game programmers set it like a grenade exploding over and over and over again at on the end of each engine.

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Trivia: If you can get to where you can see an enemy without him seeing you, and he is standing still, just sit and watch for a moment. The solders in this game can have some funny idle animations. The best is when they start swatting at the air for a moment like a bug is bothering them. Then they'll even point their gun around as if they're threatening to shoot the bug.

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Trivia: On the second Surface level, one of the buildings has some models on the tables. One is a motorcycle, and one is a chopper. They are obviously models, possibly remote control toys. Shoot either one even once and it will fall off the table and explode with very deadly force.

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Trivia: In the Faculty and Silo levels, there are scientists in lab coats running around everywhere. They are noncombatants that you get negative points for killing them. Approaching them will make them raise their hands and shake in fear. If you injure them weakly, like by shooting them in the foot or hand with a weak weapon a few times but where they don't die, some will turn on you. They will either pull out a DD44 pistol and shoot, or pull out a grenade. They will then act like normal enemies. Killing them after this still gives negative points.

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Trivia: The first level, Dam, was originally going to be bigger. Another part was in construction when the idea was abandoned. If you stand on the dock of the dam overlooking the water side and use the sniper riffle, it is possible to see another guard tower across the water in the distance. That is the unfinished part of the level.

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