Banana Blitz owns 2 in Single Player, and is just as good as 1. They improved the controls, look, music, and there's some amazing levels. I'd say it's harder than both too, the jump adds a lot more tricky elements, and there's still an entire world in BB that I have yet to unlock and see. The menu presentation SUCKS so badly though, and the minigames aren't even playable. It's a perfect recipe for anger.
Kororinpa, now that's a game with a "pleasant" difficulty. It makes the gold medal seem so close, yet so far. It makes me zone out for like 5 minutes til I beat a particular challenge, no anger, no frustration, no impatience, just pure focus.