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How do you make a start up menu, for your game?
Also how would you make the credits appear when you quit the game?
One last thing, which has to do with my second question. How do you make a 'quit game' button?

Making a menu is fairly simple. It may just involve clicking on an actor and it will move the view to the game, and create necesary actors, or it may load a game with the LoadGame function. Credits can be achieved with a text actor. When the view moves to them, set yvelocity to a negative value. On out of vision, set the y position back to the default and move the view away.
To exit the game, call the ExitGame(); function in script editor.

I dont get how the load game function works. I try to use it, and it always says it cant find the game file. and how do you do the moving the view thing?

In short, have the menu in a separate activation region (if necesary), and use the MoveTo action to move the view. More here:
http://game-editor.com/forum/viewtopic.php?t=186