75 m is an unlockable stage in Super Smash Bros. Brawl. The stage is based on the 75 m level of the original arcade version of Donkey Kong; however, it is a bit more remiscent to the NES port rather than the original arcade version.
The stage is a retro stage in the sense that it uses the original 8-bit graphics to replicate the look. Unlike Flat Zone and Flat Zone 2, however, the stage is not completely 2D, as the platforms and ladders all have depth. There are many small platforms at the bottom part of the stage, but there is also a long platform on the top, and several larger platforms on the right. The stage has walk-off blast lines on some of the platforms. Numerous ladders connect some of the platforms, along with two moving elevators with small platforms traveling upward, bringing characters to the long platform on top. The platforms cannot be jumped through from above, only from below. 75 m is the second largest new stage in Brawl after New Pork City. Masahiro Sakurai has stated that the stage is quite large, but the small platforms and dangers give the stage a cramped feel.
A key part of this stage is the Donkey Kong arcade sprite (who, according to one of Snake's Codec conversations, is actually a younger Cranky Kong), who sits on the long platform. He normally sits behind the stage in the background, but sometimes he lights up and comes into the foreground. This is preceded by the music for his theme, giving opportunity for players to react before he attacks. While he is in the foreground, contacting him causes moderate damage and knockback. Jacks will also bounce in from the left and fall after they bounce off the long platform, also causing damage and knockback. After a certain amount of time, Donkey Kong will go back into the background. All items from the original Donkey Kong game return as items in the stage, which are the Trouble Bugs, jacks, the purses, the umbrellas, and the hats. The Trouble Bugs move along the platforms and ladders, and cause fire damage and knockback upon contact. The purses, the umbrellas, and the hats can be picked up if a character touches them, and this has no effect on gameplay. The score in the top left-hand corner increases by 800 each time an item is picked up, but this also has no effect on gameplay.
Gameplay on 75 m tends to take place in the upper right hand corner. This area is much more flat and has fewer gaps than the rest of the level and is much less prone to random objects flying out and KOing players. While a large stage in terms of blast lines, it tends to feel cramped because of the many small platforms. Also, because the majority of the fighting takes place in the upper right hand corner, the stage tends to feel imbalanced towards that side. In general, it is quite difficult to KO a player off the left or bottom edges, while it is rather easy to do so off the top or right.
 Tournament Legality
Due to the stage's cramped feel, large size, dangerous hazards, generally unusual layout, and overcentralization towards the top-right corner, 75 m has been banned from tournament play as it is too difficult to play a proper competitive match on.
A glitch can occur on 75 m playing as R.O.B. On the three platforms in the lowest bottom right of the stage, if R.O.B. grabs the left ledge of the platform on the right, R.O.B. will be teleported onto the left platform facing to the right.
75 m is the third level in the arcade game Donkey Kong (second level in the NES port). On 75 m, Donkey Kong throws jacks at Mario. In order to complete the level, Mario must maneuver through obstacles and get to the very top platform. Along with jacks, other obstacles include vertically moving platforms and enemies called Fire. If Mario gets hit hit by the jacks, touches Fire, or falls from a certain height, he loses a life. Mario also has a chance to earn more points by collecting items in the stage, which include a hat, parasol, and purse. This stage in Brawl is an accurate recreation of the 75 m in Donkey Kong from the NES port; however, the bottom-most platform is now in the background. Also, the sprite of Donkey Kong is now in the background the majority of the time. When he moves into the foreground, he becomes a stage hazard and summons jacks to attack the players.