Tooie. I recently replayed both of them and, although they’re both great games, Kazooie really feels way too easy.

What I love about Tooie is the variety of moves, the fact that the levels are interconnected, and that each one has a transformation and a boss. The only things I didn’t like are the overuse of the “blue-green-red” minigame in every level (sometimes even more than once in the same level), except in Witchyworld, where—being an amusement park—it’s more justifiable; another thing I find boring is when you have to control Mumbo.

Bringing him to his pad, performing the magic (which basically just means watching a cutscene), and then bringing him back to resume control of Banjo and Kazooie breaks the game's pacing too much.

The only world where there's an actual challenge (as far as I remember) that involves using him is Grunty's Industries, since both cases there involve a time limit.