If there're spare levels, use this one.
Level Name
YtterbiJum Cliffs
Level Format
Underground
Terrain & Features
Mario starts out falling down a HUGE drop, at least 7 screens. Then, when Mario hits the ground, he enters a pipe which leads to the bottom of another huge 7-screen-high area. To get up, he has to jump on the Koopas conveniently flying back and forth across the screen. Once he gets to the top, he has to go into a pipe jutting out from the ceiling. That pipe leads to the exit.
Enemies
Flying Koopas of various colors.
Music
Cave Drums
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$100 invested at 7% interest for 100 years will become $100,000, at which time it will be worth absolutely nothing.
-- Lazarus Long, "Time Enough for Love"