Collecting gems as you rocket down a giant pipe might sound easy but this game is deceptively challenging and addictive.

A map shows you the layout of the race track with the crystals and the barriers in your path. For an added challenge, some crystals can only be collected by bouncing off barriers so each track takes several goes to perfect.

The graphics are a little basic but the game is genuinely fun and that and the sound track more than make up for a slight lack of polish.