Which Nintendo Switch game introduced the planet Popstar’s first 3D Kirby adventure?

Kirby and the Forgotten Land introduced Kirby’s first fully 3D platforming adventure on Nintendo Switch.

Nintendo released the game in March 2022. Instead of moving mainly across two-dimensional stages, Kirby explores three-dimensional environments in the New World, a mysterious setting filled with abandoned human-made structures. The story follows Kirby as he searches for the kidnapped Waddle Dees.

The game added the Mouthful Mode ability, allowing Kirby to wrap around and control objects such as a car, vending machine, or cone. It also included cooperative play for a second player controlling Bandana Waddle Dee. Kirby Star Allies was released earlier on Switch but remained primarily a side-scrolling platform game, which is why it is not the answer to this question.