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If you played Jet Set Willy on the Spectrum as a kid you’ll be aware of the notorious Attic Bug. It meant that if you entered the Attic in a game, various rooms became instakills.

Today I read an explanation of the bug: bits of non-screen memory are being written to when one of the monsters in the Attic is “drawn”.

skoolkit.ca/disassemblies/jet_…

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in reply to Alexandra Lanes

Many times I played that I would be killed instantly because the monster was drawn at the same place the character entered.