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TTT Simple - ttt_simple_otat1

am i supposed to have something downloaded? because the sky and certain textures and models have missing textures or glowing errors

I finally figured it out! For people in the future:
Use your flashlight in the blue room with a little ladder icon. It's near the room with the chessboard. This will introduce you to how the flashlight stuff works.
If you go to the same floor the chessboard is at and hug the wall near the edge above the pool, your flashlight will reveal a thin ledge allowing you to walk to the room with the blue cube.
You can also sometimes catch a moving invisible platform if you use your flashlight near one of its stopping points, most easily found near the little slopes that point in the direction of the isolated grey island. This will lead you to various setpieces around the map.

Yeah using your flashlight on various parts of the maps should reveal secrets.
I can't quite remember where all of the secrets are; you might need to explore with some people and share what you find 😜

How do I find the black cross / get the grey cross off the little island? Saw your comment and have no idea where it'd be.
Also not sure how to find those invisible platforms. Even using my flashlight didn't seem to reveal anything, contrary to what some others have said.

This map rules. Had a blast trying to solve the big puzzle.

Playing on this map with my friends back in 2019 is what got me into mapping

Ah, I see, nice.

With the latest GMod patch, this is now usable again.

Heyo!
I'm getting the same error.

Looks like the latest update has broken the way to include TTT weapon spawns.
I'll see if there's a fix.

the addon isnt even downloading correctly anymore. In the addons tab of gmod, the addon has a red border with the error-message "failed to parse addon file"