Album covers are formatted square to fit on Vinyl 33 record sleeves, and later CD covers that were the same shape. CD jewel cases were made with square art so that existing Vinyl art could be shrunk down to fit.
Video games have traditionally used rectangular boxes going back to the Atari days but most games today still have covers formatted for DVD jewel cases that were rectangular.
DVD jewel cases are rectangular for the same reason CD jewel cases are square. The previous format (VHS tapes) were rectangular.
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