Your best mapping gotchas/errors
It didn't get destroyed.
That's not a problem if you put a trigger_multiple with the kill !activator.
It didn't get destroyed.
"Hmm my map now looks like bts. Now GLaDOS InGame will now it and will kill the cubes and turrets automatically"
It didn't get destroyed.
That's not a problem if you put a trigger_multiple with the kill !activator.
I every once in a while "accidentally" console-kill the enemy player in coop. Resulting in a dc 
Once i had an almost finished map that was getting random leaks and was not compiling, i was (more 
) noobish at time and discarded without even make a quick search in google about what it was.. Last saturday i was having the same problem with the current version of map 4 of tlfs.. i did a quick search here i discovered that was because of this little guy here..
Ahh this red R made me to dont map for a month, im glad about that i today now why 
Absolutely...plus, it's so easy to turn it on by accident - the hotkey is just 'c'. Not 'Shift + c', or anything you'd have to go out of your way to do, just one key.
Wait, I thought that radius culling is normal. That red globe boundary around my map. I tried disabling it and hammer ran much faster than usual. Does that mean my maps are damaged? And I don't need to worry about the globe?
No no, your maps aren't damaged, i can promise that 
But same here, it is just lagging if i turn it on. Dont know why, but isnt it supposed to 'help'?