It's sort of a Yuji Naka day on the Wii and DSi shops today, with Naka's old game series (Sonic the Hedgehog) receiving a new entry WiiWare, and his latest series (Ivy the Kiwi?) marching onto DSiWare.

Also on DSiWare this week: games about protecting the world as a superhero, and protecting information as a data-gathering robot. Sonic is also joined on WiiWare by a trio of jumping sports.