Newton Vs The Horde has been released on WiiWare in North America (Stay tuned for a release date for Europe sometime in February). You can download Newton Vs The Horde by accessing the Wii Shop Channel on your Wii console.
Got a Wii but don’t know how to access WiiWare? Take a look at these helpful sites from Nintendo:
Connect your Wii to the internet
Find out more about Newton Vs The Horde from the RadiationBurn website.