"I'm making good progress with this completing all stages, getting all green stars and stage stamps lark."
"Oh hey, I haven't finished this stage yet. I'll do that, polish off these last stars and then can play something else!"
A BONUS WORLD HAS BEEN UNLOCKED.
"... What's the worst that the game can throw at me now?"
The answer is remixed versions of previous stages with the difficulty upped. The map is so massive that I can't see everything from the small area I currently have access to.
Keep smiling, Shiggy. Keep smiling, because when I'm done with this I'm coming for your Green Stars.
(Of course, by that point he'll tag in Sakurai and I'll have a double threat of Mario Kart 8 and Super Smash Bros for Wii U to deal with.)