Kirby’s Adventure 2 is not a title released for the Nintendo Entertainment System. The original Kirby’s Adventure was released on the NES. A sequel with a similar name, Kirby's Adventure, was released on the Game Boy, but 'Kirby’s Adventure 2' is likely a misunderstanding or refers to a completely different game in the franchise, possibly on a different platform entirely.

Kirby’s Adventure 2

Kirby's Adventure (Germany)