Asked over 3 years ago in Off Topic
Games: New Super Mario Bros. Wii (Wii)
Tags: new super mario bros, super mario bros wii, new super mario bros wii, cannons, use of cannons
They are secret warps to other worlds. Here is a good guide and the ones marked with a star are the ones that you can access the warp cannons. http://guides.ign.com/guides/14354229/page_3.html
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