Nintendo has posted a series of single and multiplayer challenges to attempt and attempt again for New Super Mario Bros. Wii.
It does take a fair bit of skill to work your way through to completing the game, and whilst Nintendo reckon it's hard enough just to get to the end, it can be even harder to pull off some true platforming feats of brilliance. Introducing New Super Mario Bros. Wii challenges - a series of fairly easy to ridiculously impossible tasks like taking out boos to earn 13 lives, or only using simultaneous ground pounds to get through a level.
Whilst unfortunately challenges like these aren't built into the game itself, you can give yourself a nice pat on the back, make a cuppa tea and smile that you're amongst the greatest Nintendo players alive...