The graphics of C-12 won't blow you away, but they are definitely impressive for a PSOne title. One thing I've always found rather neat was the way the 'grittiness' of PSOne titles can sometimes be very appropriate for games. C-12 is one such game. So while the visuals will appear quite a bit rougher than most comparable PS2 games, it doesn't suffer as much as you would think as it actually adds a bit of atmosphere. Aside from the obvious limits placed on a PSOne game in the graphics department, the visuals of C-12 are both attractive and appropriate.
Most developers understand the importance of sound in a game, and SCEA is no exception. Filled with the loud booms of explosions and the creepy breathing of an alien around the corner that hasn't noticed you yet, C-12 delivers it all. Every tiny little corner of the game contains nice sound effects that breathe life and a sense of oppression into the game. Your scanner will hum when you look through it, and your laser eye will whirr when you move your head back and forth. The music, however, is pretty much unnoticeable. While there was nothing horrible repetitive or annoying, neither were any scores very memorable.