Kirby Hack is not an officially released game; it's a ROM hack. ROM hacks are fan-made modifications of existing games.  In this case, it's a modified version of a Kirby game for the NES, potentially altering aspects like gameplay, levels, and characters.  The specifics depend entirely on the creator's alterations.

Kirby Hack

Kinnikuman - Muscle Tag Match (Japan) (Rev 1)