The game treats it at world 36-1 (since the digits are tile numbers 0-9, followed by the alphabet, then a space tile at $24 or 36). The minus world is technically an out-of-bounds level. Else, 6-7-8." This indicates that the level maps were stable when the warp code was written. * The code that decides where the warp pipes take you is implemented as: "Are we in World 1-x? Then 2-3-4. * Memory addresses assigned to warp zone control variables are at the end of their respective tables. * Each object and enemy in the game is assigned a code, and the ones used to control warp zones are assigned the last codes used in the game. And these subroutines are located at the ends of their files/sections. * Comments in original SMB source code (revealed in the 2021 "Nintendo Gigaleak") confirm that the programmer thought they were checking if Y = 0 when deciding whether to lock scrolling for the warp zone, even though the code doesn't do that. But there's a bunch of evidence that warp zones were added very late in the game's development, perhaps as a last-minute change.
It's unclear whether the error was missed in testing or intentionally left unfixed because they decided they liked the erroneous behavior better. (This is all explained much more thoroughly yet accessibly, and illustrated much more brilliantly, in the video I suggest you watch it when you can.) It was originally intended to be a much more hidden secret than it turned out to be. (Unless you're walking on the ceiling.) But because of a programming error, it keeps scrolling, revealing that the warp zone room is there. The underground 1-2 level is supposed to stop scrolling as soon as the mundane return-to-surface pipe comes onto the right edge of the screen.
For those who can't watch the video or just want a text summary:
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