New Super Mario Bros. Wii has the Super Guide, in case you ever want the game to autopilot for you, but it also has a whole collection of video tips you can view before a gaming session.
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The "hint movies" are all located inside Peach's Castle and have to be unlocked with Star Coins. Here's a sample.
Be warned, this does show an entire level in the game.
If you're intrigued, check out our full game review here.