Select the Credits option. When it reaches the Special Thanks area click on the following names for the desired effect.
|Unlockable||How to unlock|
|Giant enemies||Click SMB3W4|
|Tiny enemies||Click Chuck Norris|
Press Pause (+). The in-game clock keeps ticking while your game is paused, meaning the sun keeps moving. Wait for the sun to have set for awhile, un-pause and you will have beaten the level.