gmr_leon, 
Huh. A Konami Code was uncovered for Castlevania: Legacy of Darkness (expanded version of Castlevania 64) after 25 years.
The code is: C-Up x4, C-Down x4, C-Left x2, C-Right x2, then C-Left x2 and C-Right x2 again, and finally: L, R, Z (together, presumably?).