Twin Basin is the 49th Expert stage in Super Monkey Ball 2 and the 98th Expert stage in Super Monkey Ball Deluxe. It also appears as the 208th Ultimate stage with continues and the 248th without continues.
This stage features three platforms, which are equally spaced apart. The first is the starting point. The middle acts as a landing platform, and the last has the goal. In between the platforms are halfpipe bridges in the shape of zeroes. The sides of these halfpipes are steep and require a lot of force to make it up. The only reason this level is considered pretty hard is because of the fact that, since the player must exit via the thin edge of the zero shapes, it is hard to pick up enough speed to make it up the sides once.
To get to the goal, roll around the first half pipe either to the left or right. Go really fast and angle yourself well to get up on the adjoining platform. Repeat the same pattern for the next part, but you will have to angle yourself much more precisely this time because goal platform is much narrower than the previous platform. Once you are on the goal platform, then roll into the goal.