Disney Friends [NDS]
You first have to go see the Toy Story alien and play with him until the guardian bar, (up in the top-right hand corner) gets full and you are given a shiny ball to give to the alien.|
After you give the ball to him a couple of times, you have to leave that world and go into Stitch's world and you have to look after Stitch. When your guardian points go up considerably, you can get other friends to look after like, Dory, Simba and Winnie the Pooh.
After you get all of the friends challenges done in their worlds and their sub-worlds, Tinkerbell tells you to find her four bags of pixie-dust because she was loosing her powers.
The bags of pixie-dust are in Simba's Tall Grass Maze, Dory's Coral Reef, Stitch's Ohana Fair and Pooh's Bouncing Plains. After you find the bags of pixie-dust, Tinkerbell gives you her toy-thing and a castle-model.