Subcon

Subcon (sometimes called Sub-Con; also known as Mushroom Kingdom II in Super Smash Bros. Melee) is a peaceful dream world of the Subcons.

''Super Mario Bros. 2
Subcon is the setting of the game Super Mario Bros. 2. Subcon was once a peaceful place, until it was taken over by the tyrannical frog king Wart. Wart captured and enslaved the Subcon fairies, the protectors of the realm and imprisoned them so that they would not interfere with his evil plans.

From their confinement, the Subcons sent a message to the hero of the nearby Mushroom Kingdom, Mario, to come and deliver them from the dictator. At first Mario thought the message was just a dream, but the next day, while on a picnic with Luigi, Princess Toadstool, and Toad, he discovered a cave that led him to the very world he saw in his dream.

Mario and his friends instantly set out to free the fairies. They battled their way through Wart's army, the 8 bits, and his generals: Birdo, Mouser, Clawgrip, Fryguy, and Tryclyde. In the end they faced the evil king himself, and were eventually able to defeat him and free the captive fairies. They then awakened to find themselves back in the Mushroom Kingdom.

BS Super Mario USA
Subcon is again the setting of the psuedo-sequel of Super Mario Bros. 2 for Stalleview, BS Super Mario USA. Years later after the events of the invasion in Subcon, the world was peaceful at the time. The king of Subcon had made golden statues of the whole world's hero Mario as a thanks for saving Subcon and the inhabitants from the evil frog king Wart.

Suddenly, Wart returned to Subcon and attacked the land and overthrew the lands king and imprisoned the people of Subcon again, he than proceeded to scatter the golden statues of Mario all around the world by giving them to the generals of the 8 bits.

Finally, Mario, Luigi, Toad and Princess Toadstool returned in the world to save it from Wart's reign, fighting the 8 bits, the leaders, retrieving the statues, defeating Wart several times. By doing so, they saved Subcon, its kingdom and the king, and the world is once again at peace.

Super Mario Advance
In Super Mario Advance, there were Yoshi Eggs scattered all around Subcon, which Mario and friends has to recuperate.

Super Smash Bros. Melee
In Super Smash Bros. Melee, a stage based on Subcon called Mushroom Kingdom II appears. Mushroom Kingdom II is the second Mushroom Kingdom stage in Super Smash Bros. Melee. It can be unlocked by collecting the Birdo or the Pidgit trophy. Unlike the first Mushroom Kingdom stage, Subcon has 8-bit graphics converted into 3D and 16-bit graphics that remain 2D. Strangely enough, this stage doesn't take place in the Mushroom Kingdom, despite the name.

Physical Features
Red plants stick out throughout Subcon, which, when pulled, will give the character an item (or occasionally, a Bob-omb). A lot of the region of Subcon is high in the sky; the "land" being clouds. Subcon also has a desert, snowy lands and grass plains. The only castle is Wart's castle, and no towns is seen throughout the game. According to BS Super Mario USA, Subcon has a kingdom and a king. Wart's castle from World 7-2 is the king's castle.

Trivia

 * The name "Subcon" is short for "subconscious".
 * In Yume Kōjō: Doki Doki Panic, it was in a storybook that the kids Piki and Poki get pulled in by Wart and get locked in a cage. However, the Subcon world in that game was unnamed like the storybook. It is unknown if the world of the book and Subcon are the same place or just very similar.