For those who don't know, this is apparently one of the best games out for the Wii and great fun. The average score on Metacritic is 97/100: http://www.metacritic.com/games/platforms/wii/supermariogalaxy
Select free delivery at checkout and use the voucher for the (slightly!) reduced price.
Here's Nintendo's description:
'The ultimate Nintendo hero is taking the ultimate step ... out into space. Join Mario as he ushers in a new era of video games, defying gravity across all the planets in the galaxy. When some creature escapes into space with Princess Peach, Mario gives chase, exploring bizarre planets all across the galaxy. Mario, Peach and enemies new and old are here. Players run, jump and battle enemies as they explore all the planets in the galaxy. Since this game makes full use of all the features of the Wii Remote, players have to do all kinds of things to succeed: pressing buttons, swinging the Wii Remote and the Nunchuk, and even pointing at and dragging things with the pointer. Since he's in space, Mario can perform mind-bending jumps unlike anything he's done before. He'll also have a wealth of new moves that are all based around tilting, pointing and shaking the Wii Remote. Shake, tilt and point! Mario takes advantage of all the unique aspects of the Wii Remote and Nunchuk controller, unleashing new moves as players shake the controller and even point at and drag items with the pointer'.