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Software produced for proprietary consoles by reverse engineers, hobbyists, and more. Often targeting retro & alternative devices.

See:

• NES Roms
• Game Boy Roms
• Commodore 64

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.