Released in 2017, this time HAL Laboratory did a "full" game of the subgame "Kirby 3D Rumble" that lasts at most 10 hours, or more if you decide to get platinum on every level, but you have to be a big fan of this game to do that, so I recommend only getting the gold medal to unlock all the stages.

The gameplay is simple. You can't absorb powers or attack directly, only swallow and spit enemies, so you must defeat everything with these two controls. However, you can do combos by swallowing and spitting two or more enemies in a row, and the game has a point system, so you are encouraged to do long combos in a quick way and without being damaged to get a gold/platinum medal and get the full experience.

Also, the enemies and stages are multiple and different enough to have different strategies, so the game never gets stale or repetitive and you will want to play more after defeating the final boss. That's why the special levels that you can unlock are a great addition, with a huge upgrade on the difficulty, something I wasn't expecting, but it makes finishing them with a gold/medal satisfactory.

Sadly, this was an exclusive digital 3Ds game, so you can't buy it nowadays and it is only possible to play it legally if you bought the game when it was available... The keyword is "legally". Thankfully, some nice people create methods to preserve video games like this when the developers just let them die.