Secret in E1M9

[Master Yoda]

so there's a 'hole' (intended) where we can go out of bounds in E1M9
we then get this

https://steamcommunity.com/sharedfiles/filedetails/?id=1603385601
any other levels with secrets like these?

[Hursti]

maybe not every level, but plenty of them have those. i saw atleast 5 of those during my playthrough, most likely more

[Master Yoda]

Originally posted by Hursti:

maybe not every level, but plenty of them have those. i saw atleast 5 of those during my playthrough, most likely more

which levels?

[jeebs]

at the end of E1M2 you can use the ladder to sort bounce off over the exit fence to the area behind where you can find one of those.

[Kohchu]

Ha, that's a nice shoutout to GTA.

There was a similar easter egg in GTA3. There was a special alleyway, where if you jammed a truck and climbed on top; you could get stuck; and there was a sign that said "You weren't supposed to be able to get here you know."