I dont know all of them, but for example the earlier ones like Kirbys dream land 2; were they supposed to be ridiculously easy games? Like I do enjoy them just as a chill game to play. But im wondering what their purpose was. I maybe do recall reading they were made for younger kids. I just have always thought of Kirby as WAY overpowered and as such the games almost become blah.
I think I played one of the newer ones on switch and while it was really cool how you could become a car, I think the gameplay was still a little hand holdy.
Miyamoto and Sakurai envisioned the original Kirby’s Dream Land as a My First Game for beginners. That was an explicit design goal for the game.
That said, many of the games do have some harder postgame challenges tucked away. In fact that too dates all the way back to Dream Land’s Extra Game that can be accessed by Up+A+Select on the title screen. Extra Game is arguably still not that hard, but it does set some precedent for what’s to come in later titles.
Super Star put a bigger focus on this with The Arena, a rather long boss rush gauntlet combining every boss from every preceding sub-game, with limited healing. The remake, Super Star Ultra, adds new sub-games that pretty much pick up where the original’s difficulty curve left off - the original Super Star starts with Spring Breeze, a condensed retelling of Dream Land, and SSU’s new content starts with Revenge of the King, a remix based on Dream Land’s Extra Game. Then SSU ends with The True Arena, incorporating all the new content, including harder versions of the original bosses and a new True Final Boss.
Super Star Ultra pretty much set the tone for modern Kirby after that. Return to Dream Land, Triple Deluxe, and Planet Robobot all feature a direct reprise of both The Arena and The True Arena, the latter incorporating other postgame challenges from those games, and all of which culminate in their own True Final Boss.
Also, for a self-imposed challenge, you can always try playing without copy powers.
https://wikirby.com/wiki/Difficulty
https://wikirby.com/wiki/Extra_Mode