This game was given to me as a present and I was very dubious about it, having played 'marble madness' as a teen I thought this would be along the same lines. However, as soon as I started to play it my doubts had been cleared up - as it's a wonderfully fun game.
The controls are easy to pick up and you'll soon learn to tilt the Wiimote at full pace to pick up speed and then quickly bring it back level and beyond to slow the ball quickly and turn corners at pace. This is where the fun begins. Sure, the levels are nice to work your way through and get to the end, but the real fun is in beating the previous times, getting gold on all levels and in beating your friends in split screen mode - especially with a few drinks to lessen the reactions.
Some levels you will zip though quickly, others may have you stuck for a while. I remember one level took about 30 minutes to complete but then going back to do a time trial after completing it the time went down to 4 minutes.
There are a number of different balls that you can play as, but most of them are for novelty value and, I guess, for the children as I found myself playing with the original ball 90% of the time. There's also a few secret course which are easy to unlock, but always good to have in a game like this.
The review states it's a puzzle game, but don't expect any problem solving puzzles really - it's just a case of working out how to get to the end and just looking at your surroundings will show you the way.
The review also states "The balls are controlled using the motion sensor in the Wii remote (and nunchuck in multi player) " - but don't worry, as you can play multi player with two Wiimotes. I play against the house mate and neither of us plug in the nunchuk.