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This is it: the final level of the 8th World, and it's Bowser's Castle.
As noted in my narration, this is a no damage run of the Castle and boss fight, which actually isn't hard at all with some practice.
Honestly, navigating through the castle is easy; you can go through it without getting hit if you're careful. I noted a few tips in my narration.
Once you get to the end, the boss fight against Bowser himself commences. The ending and credits of New Super Mario Bros. Wii will be shown in the next video.