New answers tagged new-super-mario-bros-wii
Each level has 6 different layouts. Once I had those in text form I wrote a small program that generated a PDF based on these. The items with green background do not have any Bowser (Jr) in that world in that position and can be safely clicked (if you know the green patterns, you always get at least 3 items from the red mushroom).
This is my favorite Wii game and to make the game more difficult I sometimes played it without gathering any items. Actually not getting any mushrooms can be a challenge as you have to circumvent getting drawn into the "worlds" where you can get those (i.e. let yourself be killed if you do). So you can do 9-7 without star item from my notes (not sure if ...
I have not played that in a forever now, but whenever I did play it I never used Stars power ups at all, so the answer to your question is that it is possible it may just be very difficult
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