This hack you can play Chip 'n Dale 2 for Boss-Only Mode.
This is my first Chip 'n Dale 2 Hack. So, Enjoy This Hack!
Database match: Chip to Dale no Daisakusen 2 (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 0B39CD3B2EBCC8430A4B2585DFD7880BC8AE63DF
File CRC32: F4DB4C83
ROM SHA-1: BF1EE3765229AA4A1F5B5E540AC0661107099CB6
ROM CRC32: 99686DAD