How Big is the Undertale Window Size?
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Just boot up the game, press F4, and boom—full screen!
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Undertale starts at 640x480, and if it's too tiny, you can go full-screen with F4. Problem solved!
Default window size for Undertale is 640x480, but you can make it full screen by pressing F4!
640x480 initially, but F4 makes it fullscreen.
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