UFO (after reaching 100%/Kirby series Kirby amiibo)
Team Kirby Clash
Like Kirby Fighters in Triple Deluxe, Team Kirby Clash is a 4 player mode where a variety of Kirby copy abilities are used. However, instead of fighting each other, they work together to take on bosses. After each battle, they earn XP in that copy ability that improves their abilities.
Kirby 3D Rumble
Kirby 3D Rumble stars Kirby in a 3D arena in which Kirby strategically sucks in enemies and spits them out to rack up combos. There are bosses at the higher levels.
Meta Knightmare Returns
The game supports amiibo in that scanning in one will give Kirby a copy ability. Certain ones will give Kirby certain abilities. The Kirby series of amiibo will also give special costumes in addition based on their respective character. Here is what currently known to be supported: