I am making a game in 400x300px but I need to scale it to 800x600px.
I tried setting the resolution to 800x600px with stretching on, but that squeezes my levels in the frame since I have levels that are longer than 400px. Does anyone have a solution? I have seen it been done before in games by fallen angels and others (Cave story as well but I don't know if thats in MMF2). I've tried the viewport extension but that only zooms within the 400x300px.
You changed the frame size of the levels, when you need to change the virtual width and height. Change the frame size back to 400X300 by clicking on that blue box in the storyboard editor. Then click on each level in the workspace toolbar and change the virtual width and height to the size of your level in the properties box.