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Alright, this is all super informative. Thanks so much folks 🙏

Oh that rules, thanks so much for the detailed explanation! Do you know offhand if stairs can "build" down as well in the old Doom format (e.g., if I'm making a trap door down to a basement area, or something). Stairs_BuildDownDoom does exist on the ZDoom wiki, though I'm not seeing the equivalent in SLADE, though maybe that's due to the software & not the format.

Heya, I'm just sort of studying the classic DOOM93 maps in SLADE at the moment, and I was wondering about stair-building. For instance, towards the end of E1M3, there's a stairwell leading up to the exit. The selected linedef in the image has special `8: W1 Build Stairs 8`, and triggers the first step. The subsequent stair sectors alternate tags between 0 and 999, up to the top stair. I'm trying to understand the setup for future reference. If I wanted to change the direction of the stairs, is that just a matter of flipping the linedef directions? Or does the order of the alternating tags matter? SLADE's action window doesn't seem to have as many options as the action wiki suggests, so I'm not sure how to change/setup these things. (Also, first-time SLADE user/mapper-in-general, so I'm still very much learning all the different tools 😅)