A second player can drop in at any time to control Gooey, a friendly blob who shares Kirby's ability to copy enemy powers.

to the base level of the Nintendo Switch Online service. Open the Nintendo eShop on your Switch console.

To unlock the true final boss (Zero), players must solve specific puzzles in every level to collect hidden Heart Stars. 🕹️ How to Download and Play on Nintendo Switch

for "Super Nintendo Entertainment System - Nintendo Switch Online" and download the application for free.