A new challenge! Similar to the first Other Castle this tries to give you fun new levels to sink your teeth into. The game saves your progress and you can continue at any point. Check out the manual for additional hints if you get stuck. Have fun!
You need to patch a unheadered USA ROM version of the game. I would recommand this tool to patch. https://romhacks.org/utilities/floating-ips-utility/Hashes:
Filename: Super Castlevania IV (U) [!].smc
CRC-32: b64ffb12
SHA-1: 684c1dfaff8e5999422c24d48054d96bb12da2f4
Relevant link: https://github.com/bogaa/OtherCastle2
YouTube Video: