Professor Oak's lab tilemap corruption glitch
The Professor Oak's Lab leaving glitch, also known as Professor Oak's Lab tilemap corruption is a natural glitch which occurs in Pokémon Red and Blue.
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This glitch can occur very rarely when repeatedly trying to leave Professor Oak's Lab without picking a Pokémon at the beginning of the game and may cause the player character to become invisible with tilemap corruption (including vertical 'a' lines, ":Q", ":I", "eQ") after the start menu is opened.
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