This simple hack patched out the (infamous) copy protection routine from the original game that prevents the player from reaching the final boss in a pirated copy (like Shui Guan Pipe).
Database match: not found
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: FB983F66B01D6B8431452E82E82629A776913653
File CRC32: E981A729
ROM SHA-1: 97E8D11B756DEFE576C3778B60CC6DFBE6DE3BC1
ROM CRC32: E6BDBB0C