Twin Basin is found in world 9 of story mode and in expert challenge mode in Super Monkey Ball Deluxe. It features 3 platforms, equally spaced apart. The first is the starting point, the middle acts as a landing platform and the last has the goal. Imbetween the platforms are halfpipe bridges in the shape of a zero (or an elongated dohnut). The sides of these halfpipes are steep and require a lot of force to make it up. The only reason this level is hard is because of the fact that (since the player must exit via the thin edge of the zero shape, it is hard to pick up enough speed to make it up the sides once, let alone twice in 60 seconds.