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Twinsen's Odyssey Hints
How can I open doors?
1 of 4: If a door is not locked, you can go through just by walking into it.
2 of 4: Some doors are controlled by switches. If there isn't a switch in reach, your Magic Ball should be able to reach it.
3 of 4: Others require keys. Keys are generally found like other power-ups (by searching with the "action" key) or appear when you've killed an opponent. In most cases, leaving a room will cost you your key, and you'll have to get another when you return to the room.
4 of 4: If killing all the opponents and searching doesn't work, the door may not be openable from where you're standing -- some doors only open from the other side. Or it may require solving a puzzle, in which case the hints in this file should point you to how to open that particular door.