Something pretty amazing been found on that game recently
If you watch this :
http://www.youtube.com/watch?v=DUZgYB4If0E
At some point near end, says "Richter Special Mode", then shows few awesome passage where richter get trough floors litteraly
For years nobody knew how to "activate" this stuff, had a savestate but who knows how to trigger the memory bug... well now it seem to be uncover
While in alucard game, turn into a mist or bat (and dont turn it off) then soft reset (L1/L2/R1/R2/Select/Start) and load a richter save, should be able to perform the tricks in the video, tought, i dont know yet if it work on usa release, was just tested on jap original release
This may (or not...) enable nasty strategys for alucard or richter speedrun, and would require to have dirty sram in order to achieve it