1.How do i make a door that opens by a button?
2.How do i make something that will push me up?(Like the surf maps if you ve ever played).
3.How do i "Add" a new sky to a map that other players will be able to download it when the server is changing map?
4.Also how do i add a sound to a specific location/that when a player passes from it it starts playing?
I once tried it and failed really hard,in other words nothing happened xDD hahah
Make your door, name it. Make a func_button that targets your door.
Make an ambient_generic, name it. Make a func_trigger (or whatever it is called) and target the ambient generic.