Developed in association with RadiationBurn, Newton Vs The Horde is now available for WiiWare (North America out now, European version coming February) and iOS, with an Android version coming in Februrary 2012.

WiiWare

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
Nintendo WiiWare

iOS