What kind of game would you create in this situation?

[Cheebee]

Something uber-casual with tons of easy-to-get-into, pick-up-and-play, hard to master and heavily addictive minigames. Set in a varied, huge, easy to navigate sandbox overworld you could walk around in with your Mii. Downloadable content, like new games every week, mii-integration, simple online play, great multi- and singleplayer modes and funny customization options. It'd sell millions.