Spiderman 3 game how do you unlock Venom?

I just beat the game as black suit spiderman (on XBOX 360) and I looked under playable characters, and Venom isn't there, How do I unlock him?|||Unfortunately bro, you can't unlock Venom. =/|||Venom is unlockable. However I have it for the Nintendo Wii so I dont know if theres a difference. Once you beat the whole game and you hear a sound like a dinging sound that means theres a spider emblem or a piece of venoms suit near by. Spider emblems unlock the black suit pieces of Venoms suit unlocks Venom. But I only know the Wii version. Each Spider-Man 3 game is different. Good luck!