To play as hyper venom. Put the cursor on Chun-li and press: R, D, D, D, D, L, U, U, U, U, R, R, D, D, L, L, D, D, R, R, U, U, U, U, L, L, U.

Pressing kick to select him will give you ice blue venom, punch will give you blood red venom.

As with all secret characters in the home version, you only have to enter the code once. After it is entered go to Chun-li and press Up to select Hyper Venom. Once the Dreamcast is turned off then on again, you will have to reenter the code.