Mirage Tower is easier to get to than most people think. The desert is a 5x5 box that loops around itself. When you want to get to the tower you enter the desert and your in box 1-3. Go DOWN to box 2-3, than DOWN to 3-3, than you go to the LEFT side of the screen through 3-2, LEFT through 3-1, and LEFT one more time will be Mirage Tower.

[1-1][1-2][1-3][1-4][1-5]
[2-1][2-1][2-3][2-4][2-4]
[MT][3-1][3-2][3-3][3-4][3-5]
[4-1][4-2][4-3][4-4][4-5]
[5-1][5-2][5-3][5-4][5-5]