Topofobia

You woke up in a strange maze with white walls; you remember nothing, feeling only an unusual pain at the back of your head—as if someone had struck you to knock you out. But there is no time to dwell on that now, for the first thing you encounter is a door covered in locks: a blue padlock, a red padlock, a plank nailed across the door, and a keypad with ten number keys and a display showing four digits. Now you must unlock the door, and the only way to do so is by exploring the maze—little do you know that a bizarre creature is hunting you.