what is the code to like the door?
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Sorry, I'm not quite sure what you mean by that. If you're talking about the final door, your character should open it automatically if you have all 3 secret keys in your inventory when entering the final room in the web version of the game.
(If you're playing the Python version instead of the web version, I'm pretty sure the command is "unlock," but I don't quite remember. The "help" command should list it though.)