Dear Mario: Please come to the castle. I've baked a cake for you. Yours truly-- Princess Toadstool; Peach
—Princess Peach, Super Mario 64 DS
With Mario invited to Princess Peach's castle, the Lakitu Bros. begin recording. As they fly across the castle grounds, they approach a rising Warp Pipe. And from it... Mario jumps out! From here, you're able to take control of him. Peach's castle grounds is perfect for this, as it's an open space with trees to climb, water to swim in, and plenty of space to run around and practice jumping.
When you're ready, head to the castle bridge to talk to one of the Lakitu Bros., who vows to film Mario as he journeys to reclaim the castle's Power Stars. From there, you can head into the castle's ground floor.
In Super Mario 64 DS...[edit | edit source]
As Mario emerges from a Warp Pipe, two more will appear, with Luigi and Wario emerging from them. The group of three then enter the castle. Later, Yoshi, who was sleeping as the three arrived, is woken up by one of the Lakitu Bros. He tells Yoshi that Mario hasn't returned since entering the castle, urging Yoshi to look for him. From here, you take control of Yoshi.
The door to the castle is locked. After reaching it and heading back, one of the Lakitu Bros. will tell Yoshi that a rabbit nearby has taken the key, and that you should look at the map on the touch screen to try and find him. The rabbit is located in a hedge maze to the left of where you started; go there and chase down the rabbit, which will try and run away from you. Catch it with your tongue, and he will give you the key. You can now unlock and enter the castle's ground floor.