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A game where you have to start over from the beginning when you die. Often goes together with procedural generation, so it doesn't get boring!

Shoot 'Em Up or shmup games are a subset of shooter games where the player continually moves forward while waves of enemies enter the screen. Both shooting and dodging are critical to advancing. See also Bullet Hell.

The larger universe outside of Earth's atmosphere. Sometimes really, really far outside of it.