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Typically shoot em' up games where the emphasis is dodging a large number of bullets on the screen at once. Bullets form dense patterns on the screen that require precise controls to avoid.

When things go boom. These games have one or many explosions.

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.