I have all 150. It helps that I played the N64 one over a dozen times. The prize at the top of the castle is even more worthless than the N64 version...
I dont even have the DS yet...too expensive..And I am poor ...Well I can afford stuff..just not that because I think a computer is better...I love the N64 of mario though..Is it really like Mario DS?
You know on the N64 Version, you don't need 70 to get past the neverending staircase? I wonder if it's possible on this one. Anyway, to do it, you need to do long jumps backwards. After a while, the game kinda glitches and Mario will do multiple long jumps at once and he'll keep doing so until he reaches the top. There was a video on GameFAQs... I tried it out, and it works. The lowest number of stars you can get before you can get to Bowser in the Sky is apparently 31, as there's a trick to get past even the 50 Star Door. I don't know what it is, though...