Recommended categories for Shoot Em Up Games
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USER INTERFACES --- User interface and menu naviation

EXPLOSIONS --- Explosions

WEAPONS\Firearms\Fire Real Time Strategy (RTS) --- Firearms mastered for RTS games

WEAPONS\Sci-Fi --- Futuristic weapons

ELECTRICITY --- Force fields

VEHICLES\Thrusters --- Thruster and fire/flame effects

IMPACTS --- Impacts of various sorts

WEAPONS\Rockets --- Rockets and missiles

VEHICLES --- Land / Air / Space vehicles