Mushroom Kingdom (Adventure Mode)
Mushroom Kingdom (sometimes also called Mushroom Kingdom III or Mushroom Kingdom Adventure) is the first stage of Super Smash Bros. Melee 's Adventure Mode. Its design is reminiscent of classic Mario platforming levels, complete with Goombas, Koopa Troopas, and Koopa Paratroopas.
 Stage description
Near the beginning, the player must hop across a series of platforms in water. As swimming does not exist in Melee, falling into a water nearly guarantees the player getting KO'd. After this, the player enters an elevated platform where a team of 10 Yoshis must be defeated to continue. After this, the player must cross a series of pipes and then reach the ending flag. As a reference to Super Mario Bros., the player must cross a flag in order to complete the level.
In Super Mario Bros., Mario must move from the start of level on the left to the end of the level on right while going through obstacles, defeat enemies, and break blocks. The majority of the Mario games, including Super Mario Bros., take place in the Mushroom Kingdom. In Melee, the first level of Adventure Mode is simply called Mushroom Kingdom. The goal of the level is the same as it is in Super Mario Bros. A common obstacle in Super Mario Bros. were green pipes. Some were just obstacles, but some could be used to transport Mario to a different area. In Melee, there are some green pipes, but they are closed off; therefore, they cannot transport players through the stage. In Super Mario Bros. 3, there are some levels that feature horizontal pipes that act as platforms. Towards the end of the level in Melee, there is a long pipe that acts as a platform. In some levels in Super Mario Bros., there are giant mushrooms that act as platforms. The giant mushrooms seen in the background of this level in Melee could be a reference to the giant mushrooms in Super Mario Bros. Also in the background of this level is a 1-hole golf course, which may be a reference to the Mario golf games. Another thing that is in the background of this level in Melee is Princess Peach's Castle from Super Mario 64. When Mario reaches the end of the level in Super Mario Bros., he must jump and pull down a flag from a flag pole in order to clear the level. In Melee, there is a flag pole at the end of the level, but the player does not pull it down in order to clear the level.
A common enemy in Super Mario Bros. are Goombas. In order to defeat a Goomba, Mario must simply jump on it, but if a Goomba runs into Mario, he takes damage. In Melee, Goombas appear as an enemy and do the same things as they did in Super Mario Bros. Another common enemy in Super Mario Bros. are Koopas. When Mario jumps on a Koopa, it retreats into its shell. Mario can then either bump or jump on the shell to cause it to slide along the ground and do damage to other enemies; however, if Mario waits too long the Koopa will come back out of its shell. There were also Koopa Paratroopa which were Koopas with wings. Paratroopas used their wings to either jump or float. If the Paratroopa is floating, green ones will move side to side, while red ones move up and down. If Mario jumps on a Paratroopa, it looses its wings and turns into a normal Koopa. In Melee, Koopas and Koopa Paratroopas appear as enemies and act the same as they did in Super Mario Bros. 
 Playability through hacking
Like almost all stages of its type, Mushroom Kingdom is accessible in multi-player modes through hacking. The game will crash when the Yoshi team's area is entered.