Suggestion:
Challenge 1: Collect all three star coins for each level on each world to open up the respective star level. Several star coins requires some serious searching and others require some above average talent, but to make it a little easier you only have to grab them one at a time and your progress can be saved.
Challenge 2: Collect all three star coins on each star level. If I remember correctly these are easy to find but some are very difficult to get. I played the ice/piranha plant level about 30 times.

{ 3 comments… read them below or add one }
Should be common sense. That's it. It is beaten. You can replay it, but that is all.
you need to collect the star coin of all one level to unlock one stage in world nine. Its hard but well worth it
You unlock world 9
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