The box art font is custom as far as I know.
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in the dead gods pad scan and press the thing that appears
The ROBLOX Logo is NOT a font. It was hand drawn, so there is no way to obtain the ROBLOX "font" because there is no font.
The closest thing I could find is Futura LT Extra Bold.
It is in the right top corner of the website in yellow font.
I can't find it anywhere on the net, but according to WhatTheFont, it is Litera.