The Princess's Secret Slide

N64
Through the top door to the right from the foyer is a tower with three stain-glass windows of the Princess. There is a note from Peach that says "Mario!! My castle is in great peril. I know that Bowser is the cause... and I know that only you can stop him! The doors in the castle that have been sealed by Bowser can be opened only with Star Power. But there are secret paths in the castle that Bowser hasn't found. One of those paths is in this room. and it holds one of the castle's Secret Stars! Find that Secret Star, Mario! It will help you on your quest. Please, Mario, you have to help us! Retrieve all of the Power Stars in the castle and free us from this awful prison! Please!"
Okay, Peach. We're working on it. The window to the right holds the Secret Slide. The slide music starts playing. We land in a room at the top of the slide and trigger the Blue Coin Switch to the right. We start sliding down the slide, which loops around frequently and loses its guard rails. I make it to the end with a time of 0'29"9. There is a Star in the item block.
Star Get #30, 80 Coins, 4 Lives
We get a message: "You've recovered 30 Power Stars! Now you can open the door with the big Star! But before you move on, how is it going other wise? Did you pound the two columns down? You didn't lose your hat, did you? If you did, you'll have to stomp on the condor to get it back! They say that Bowser has sneaked out of the Sea and into the underground. Have you finally cornered him?"
The answers to the questions are "It's going fine" for the first question and "No" to the rest. This is what happens when you try to get as many Stars as possible before taking on Bowser.
If we go into the Secret Slide again, we can get another Star if we reach the end in under 21 seconds. We do so with a time of 0'20"8. We're cutting it close here. To go faster, push the control stick forward and avoid touching edges or walls. There is a point where the slide doubles over on itself. If you jump off at the right spot, you can skip part of the slide, shedding seconds off your time. This is easier to line up with the DS's Touch Screen map. We didn't risk the jump. If you, at any point, reach the end of the slide in under 21 seconds, the Star will appear just as you cross the finish line. Get that Star first, if you haven't gotten the one in the item block. Getting either Star will cause you to warp back to the foyer and have to slide again.
Star Get #31, 25 Coins, 4 Lives

Nintendo DS
We go into the room with the four bordered doors and the stain-glass windows. There are only two windows here, but the slide is in the one on the right. The sign says "My castle is in great peril!! I know it's because of Bowser again. Will he never tire of terrorizing us? He stole the castle's Power Stars and disappeared into the walls along with us! Retrieve all of the Power Stars from the walls and the paintings in the castle. Here is a hint: there are secret paths in this room, and one of them leads to a Secret Star! Find the Secret Star! It will help you on your quest."
We jump into the window and land at the top of the slide with the slide music playing. We hit the Blue Coin Switch and start sliding. We get lots of coins and a 1-up. We reach the end with a time of 0'20"72, so the Star appears as we cross the finish line. We get that one and ignore the one in the item block.
Star Get 33, 63 Coins, 5 Lives
We jump in again to get the Star in the item block. We hit the Blue Coins Switch, get lots of coins and another 1-up. We finish with a time of 0'24"83. We hit the item block for the Star.
Star Get #34, 71 Coins, 7 Lives
The next Star is the Switch Star in Goomboss Battle.