Scene Select

In the title screen, press Select, then Start to bring up the configuration screen. On the second controller keep pressed A, X, L, R while pressing Start on the first controller. Now the scene selection screen should appear.
Code                    Effect
In the title screen press Select & Start to bring up the configuration screen. On the 2nd controller keep pressed A X L R. Press Start on 1st control	Brings up a scene selection screen


Passwords
Level Passwords

From the title screen, go to "Start", then "Use Password".
Password                Effect
Moon - Star - Balloon - 1UP - 2UP	Stage 15
Alfred - 2Up - Star - Moon - 1UP	Stage 8


Secrets
Warp up to level 6

Locate the giant sunflower balloon in level 1. Get to the right side of the screen without releasing the balooon. Once toushing the right wall, jump stright up to find a hidden block. Use the block to jump left off the screen, then walk left to find the warp.