This hack replaces the password options with simple Save and Load options. What it saves is the same information contained in a password.
Save at Game Over:
Choosing SAVE will write the game progress to SRAM. It will return to the Game Over screen until you choose CONTINUE.
Load at menu screen:
Choose LOAD and it will start the game with the progress you saved.
Technical info: The 16 bytes that describes the password is saved and loaded to/from SRAM at $6000-$600F.
There are two ips files, "cv2SRAM.ips" for NTSC roms and "cv2eSRAM.ips" for PAL.
Castlevania II - Simon's Quest (U) [!].nes - GOODNES 3.14
CRC32: A9C2C503
MD5: 1B827C602C904D8C846499C9F54B93E0
SHA-1: D6B96FD98AE480C694A103FE9A5D7D84EEAFB6F7
SHA-256: F045D72683D3156555ECCBB56090888F03A15E5B25E59DB49DCA7A87330472D3