Nowhere

Nowhere is the secret, DLC-exclusive, 7th floor accessed by possessing the Err: Integer Overflow cartridge and completing Floor 6. The cartridge will appear in runs after the player has completed Floor 6 once (on either difficulty), and is hidden behind a bombable wall. The room is unmarked, like a Secret Room, and more well-hidden. However, obtaining a map makes finding it trivial.

The floor itself appears as a glitched space, with tilesets borrowed from the other floors appearing in its rooms, with room layouts that sometimes appear unconventional (featuring tiles and traps in abnormal locations). Because of this, the theming of the floor on a room-to-room basis is chaotic, with enemies of all types as well as new enemies that are amalgamations of two already-existing enemies.

When entering a room, it will be themed as a room from one of the six previous floors and after defeating the enemies within, the walls will begin to blink between different tiles, many that do not appear intended to be wall tile, and the background will turn black.

Unlike the previous floor, shops can appear here, providing the player with some relief. Aside from the tiling on the walls of the room appearing glitched, the shop itself is normal.

Notes/Trivia

 * An integer overflow, in programming, occurs when an operation forces a number to exceed its range constraints. For example, if a number is allowed to be within the range 0-10, then adding 1 to the number 10 will cause an overflow. The nature of how a program handles this can vary, but in some cases it can result in the program being in a glitched state, as Nowhere reflects.
 * The glitched nature of the level is not only a reference to the concept of integer overflows, but more specifically to glitched levels in games overall.