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Design Mobile Game Design Designing the Characters and Scene Document Setup for the Scene & HUD

Document setup for iPhone 4/4s and up?

Hi! Suppose that the minimum resolution for our app is 640×960 and not 320×480, then what could be the best document setup that we can use for the design without having difficulties in adjusting for the newer iPhones with higher resolutions?

I suppose that I can safely base the document size to the default 640×960 but how about the gridlines and subdivisions part?

I remember that the instructor halved the width size in the video using the 1136 width from the iPhone 5 resolution but I can't seem to understand that.

Thanks so much! Hopefully someone can help me :)