I decided to dig up this review I did for a games site last year.
The idea of Switchball is to roll a ball across a physics-based 'assault course' with the help of power-ups and a lot of patience. The puzzles are well thought out and feels very satisfying when you complete them. However, if you can't work them out it can be equally as frustating, especially the puzzles that focus on balance or timing. It also has very realistic physics however it is let down by restrictive camera angles. It may be harder for younger children because of a large difficulty curve and the required levels of dexterity and patience
The graphics are very good with a unique style to each of the 5 worlds. The lighting and ambient effects really draw you into the environment, sometimes helping you to focus better on the task.
You will get half of them from playing through the single player. Others require you to play online and in co-op but some may take a lot of work, such as getting silver and gold medals. All in all, a good list for those of you who want something to work towards when playing games.