Super Mario Land

Super Mario Land
Developer: Nintendo R&D1 Publisher: Nintendo Platform: Game Boy Released in JP: April 21, 1989 Released in US: July 31, 1989 Released in EU: September 28, 1990 This game has unused objects. This game has unused music. This game has revisional differences.

Super Mario Land is the first portable game in the Mario series, as well as that time Mario cheated on Princess Peach with Daisy.

Unused Hidden Blocks

Please elaborate. Having more detail is always a good thing.

The game reserves a tile in these two places in World 3-3 for a hidden block, but it cannot be triggered by normal means.

(Source: Original TCRF research)

Unused Music

The ladder-climbing track for the bonus game runs almost 8 seconds, but only the first 2 are heard normally. This may suggest the track once had a different purpose.

To listen to the full track, edit address $DFE8 to 0x0A or use the below Game Genie code to play the track in World 1-1:

Version	Code
Rev 0	0A7-B7F-F76
Rev 1	0A7-CEF-F76

Revisional Differences

Audio

All of the music was changed stereoscopically in Rev 1.

Rev 0	Rev 1

The death jingle had a noise percussion track added...

Rev 0	Rev 1

...As did the goal fanfare.

Rev 0	Rev 1

The autoscroller theme had its percussion changed from alternating between both channels to always stereo.

Almost unnoticeable, in some tracks the first percussion sound was moved from stereo to the right channel:

Sarasaland

Rev 0	Rev 1

Cave

Rev 0	Rev 1

Credits

Rev 0	Rev 1

Popping was removed from some tracks, particularly noticeable in the intro of the Chai Kingdom theme and the track that plays when you rescue Daisy at the end of the game:

Chai Kingdom

Rev 0	Rev 1

Oh Daisy

Rev 0	Rev 1

Audio IDs

Rev 0 will accept invalid audio IDs and attempt to play (glitched) soundtracks. Rev 1 doesn't play invalid IDs at all.

Screen Wraparound Glitch

In Rev 0, there is a glitch that allows Mario to wrap around the screen on autoscrolling levels by holding Left while he is getting pushed offscreen. This was fixed in Rev 1.

Oddities

Misplaced Objects

A Nokobon/Bombshell Koopa is placed right above a pit in World 3-2. If you're quick enough, you can just barely see it as it falls to its doom.

Falling platforms inside the ground.