When you get to the dark room there are some lockers, use the key to unlock one and get the costumes. With Claire you get a cool denim jaket and the Colt S.A.A. gun. With Leon you either can choose a leather jacket with a skull on the back or a tank top and a baseball hat.

Resident Evil 2 Bonus Weapons
If you finish the game in 2 1/2 hours or less on mission A and get a rank of A or B, you will get the rocket launcher with infinite rounds.

On Mission B you have two options: If you finish the game with an A or B ranking and under 3 hours, you'll get infinite sub-machine gun. If you finish the game with an A or B ranking in under 2 1/2 hours you will get infinite rocket launcher sub-machine gun and the almighty gatling gun.

Resident Evil 2 Unlock Hunk Game
To play as Hunk, beat the A and B games of either character (Leon or Claire) with an A rating on both. Hunk is one of the SWAT members from Umbrella who's mission is to get to the roof-top from the sewers.

Resident Evil 2 Unlock Tofu Game
To play as Tofu you must beat 6 scenarios with an A ranking. Tofu's mission is the same as Hunk's -- get to the rooftop from the sewers. However, it's much harder this time as Tofu is only armed with a knife and cannot use guns!

Resident Evil 2 Ranking System
To get an A ranking, beat the game in under three hours and don't use any First Aid sprays. (You can use herbs, though.)