Subspace (alternatively Sub-space or Sub-Space), also known as the Hidden World, is an alternate dimension to Subcon in Super Mario Bros. 2. In Subspace, the terrain is dark and mirrored on a single screen, which the player cannot travel beyond. Subspace can only be accessed by use of the Magical Potions (which create doors leading to the land) in Super Mario Bros. 2.
When Mario or his friends enter Subspace, they only have a few seconds to get the Mushroom that may or may not appear; it depends on where in Subspace the hero has entered. In Subspace, all items found in any available red grass are transformed into coins when the player plucks them, giving the heroes an chance of earning extra lives in the slot machine Bonus Chance at the level's end, though they can only do this for the first two visits (any still-standing grass tufts give unripe vegetables afterwards). Depending on the area, players can also collect cherries, Starmen, and POWs. Cherries and POWs do not vanish upon returning to the main level, allowing one to effectively collect/use them twice.
There are no enemies, but Phanto can follow the player into Subspace if he or she was holding the key. The player can still die by falling into a pit or drowning in quicksand. However, doing so will allow another chance to gain coins.
In the game's 16-bit remakes, the background is the same, but the level terrain is colored-in, rather than black. Additionally, in Super Mario Advance, Yoshi Eggs are hidden here after Wart is defeated.
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