Rayman is a popular video-game character on many platforms.
This hack replaces main character with Rayman, and changes enemies graphics with Rayman series characters.
The levels have not been changed, apart from minor differences (the major difference only that post-credits levels placed after the first final boss battle, but are less difficult).
The music was replaced with both original tracks and covers/remixes of famous tracks.
spoiler: track list in the music_list.txt file.
Database match: Rockin' Kats (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 56A494CDF35D11B515D3BD3630396CE97ADD66E1
File CRC32: A3B4F5DE
ROM SHA-1: 4B94BB29C17AED8467C51352382FA01F5809DC50
ROM CRC32: 8927FD4C