THIS IS A HALF LIFE 1 MAP
I was reading the scripted_sequence tutorial for a while and finally got the idea. But when returning to my map i couldn't find the Trigger_once entity anywhere! I opened the example file from this site and there it was, a Trigger_once, and it even poped up on the entity list on this map (among whit many other triggers i couldn't find in my maps). I tried to copy it and paste it on my map but it wouldn't appear.. Whats going on? Why don't i have one of the basic triggers? (I use Hammer 3.4)