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[twillight]

A good, somewhat original first person shooter.
Besides running around shooting down targets, you also gain special (magic) powers, like possession, or locusts (what is a fire-and-forget damage-over-tme thing).
It's a bit low on the frame per second (meaning computer sickness is possible), though still somewhat better than Doom and Quake, and the amount of ammo and enemies are well measured (meaning they give a reasonable amount for the average player, but that also means at times you'll see your quantities get close to zero - this is intentional), plus there's no creasy sommersaulting enemies, like in Quake.
It has a top-notch story for its time too.
The only negative I can recall is, I could never legitimately beat the boss.