Extra Lives - First Ghost House
In the first ghost house, fly up to the upper left corner. You will see a ledge. Run to the right. Ghosts will try to hurt you but keep running and they can't get you. At the end of the ledge you will fall and there will be four extra guys. You will have to hit the boxes to get them. Go though the door. There will be a Moon (3 lives.) After you beat it there will be a level above the ghost house. Go to it. In it there is five boxes. The two left ones contain, flowers. The two right ones contain feathers. The middle one has Yoshi. If you already have Yoshi then it will be an extra life. To exit, run off the screen.

Extra Lives - Vanilla Secret 2
Enter Vanilla Secret 2 and get to the half-way mark without killing any Koopa Troopers or the green jumping guys. Keep on going until you reach a pit with a lot of spinny orange guys. There will be yellow blocks right above the pit. Hit the blocks until you get a silver "P" switch.
Carry this switch a little past the half way mark until you reach two pipes with red guys jumping out of them. Put down the "P" switch, step on it, and run back to the start of the level. While your running there will be a lot of silver coins on the way. Get all the silver coins you can and you will gain 50+ lives!
Important: Be sure not to kill the Koopa Troopers (or the green junping guys) on the way to the "P" swich, those guys turn into the coins that give you the lives.

Extra Lives - Yoshi's Island 1
Get a cape and go to Yoshi's Island 1. There is an area with one Rex on the hill and three more below it. After killing them all, fly up and you'll find a Moon worth 3 lives sitting in the clouds.

Replay Castles
To replay any castle or fortress you've completed, hold L + R when entering.

Unlock the Star Roads

• Star Road 1:
  Beat Donut Plains 1 the special way by getting the key. There is now a spot in the water. Beat it by getting the key. Then you go down to a Ghost House. Proceed to first door. Go left until you find a P. Take P back to door standing in mid air. Hit P block Don't enter door! Rather, jump up to the middle block above door. A bean stalk will come out. Follow bean stalk up to ledge. Cross ledge to blue door - hurry because the door will disappear soon. Enter blue door and defeat Big Boo to get to Star Road.
• Star Road 2:
  Beat Vanilla Dome 1 by using the key. Vanilla Secret 1 will appear - follow it. Make your way up until coming to a spring pod. Take spring pod to blue blocks. These are special blocks and must be filled in first. Put spring pad on the blue blocks. Jump up - there will be a green pipe on your left. Enter pipe and proceed to finish line. Your Star Road will appear.
• Star Road 3:
  Proceed to Forest of Illusion 1 and beat it using the key. Proceed to the fortress and beat it.
• Star Road 4:
  Find the Cheesecake Bridge's secret exit. Beat the water stage that appears. The Star Road will appear on a nearby island.
• Star Road 5:
  Find the secret exit in Valley of Bowser 4. A pathway will open up to the Star Road.
• Star Road 6:
  Find the secret exit in Star World 5. A secret Star Road will open up, revealing 8 special levels.

Warp to Bowser Castle
On the last Star Road, press B. This will put you in the Valley of Bowser without beating castle #7.