Got you covered Jordan. Heres the answeres
1) Trigger zones. Say when the player reaches a certain point and you want something to happen. Trigger zones are just like sound zones and heal zones. Sound zones and heal zones are just preset trigger points. Get it now? sweet.
2)You can change the skys under the build game options in global settings. Need more specific instuckions, just ask.
3)There is no lightmapping(lights) in test mode. Testing is meant to get a layout of your level.
4)Don't know I haven't messed around with the demo, I just have the EA. But if you mean making a one level game, That is completely possible.
5)You mean like frienlies or allies. You cannot do that with the EA or in V1 unfortunatley.
I hoped this answered your questions. Feel free to ask more,
DA ChieF
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