Set the system date to December 25 to unlock an elf costume for Selene Strike and a snowman costume for Rumble Man.
Game Shark Codes
Master Code (Must Be On) EC87F520 1456E60A
Infinte Health P1 4C896BC8 1456E781
Quick Recovery P1 4C896BCC 1456E781
One-Hit Kill P1 4C896BC8 1456E7A6
No Stamina P1 4C896BCC 1456E7A5
Infinite Health P2 4C8A9238 1456E781
Quick Recovery P2 4C8A923C 1456E781
One-Hit Kill P2 4C8A9238 1456E7A6
No Stamina P2 4C8A923C 1456E7A5
Unlock All Characters 4C894034 1456E7A84C894038 1456E7A84C89403C 1456E7A84C894040 1456E7A84C894044 1456E7A84C894048 1456E7A84C89404C 1456E7A84C894050 1456E7A84C894054 1456E7A84C894058 1456E7A84C89405C 1456E7A8
Championship Mode Codes
Max Cash 4C8C0C00 1456B00C
Max Strength 4C8C0C02 14562B8F
Max Stamina 4C8C0C06 14562B8F
Max Endurance 4C8C0C0A 14562B8F
Max Dexterity 4C8C0C0E 14562B8F
Max Experience 4C8C0C12 14562B8F