Warp Cannon To World 5!
Go to World 1-3.Get a Yoshi or a Flying Suit thingy.When you see that ledge that leads into the wall,jump on that ledge but don't go into the wall with al the coins.Jump with Yoshi or Fly with the Flying Suit to the top of that wall that's hanging down.Keep going right untill you go into a pipe. This is the alternate ending which leads you to the Warp Cannon that goes to World 5.
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P.S.This doesn't take you to the 1-Tower.You will have to do the level over again and get the correct ending to go to the level 1-Tower.
Added by: moemoerocks Feb 6th 2011, ID#4295