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Bioshock 2 Hints
How can I open this locked door?
1 of 6: You can't hack the lock, so you'll need to use the keypad.
2 of 6: Click on the little arrows to the left and right of the keypad's tumblers to change which numbers they display.
3 of 6: As for what the combo is, it's written on the door's steamy window.
4 of 6: Since you couldn't help but see that while going toward the keypad, the game credits you for knowing it, and it'll appear on a scrap of paper to the right of the keypad display.
5 of 6: It's 1540, so set the top tumbler to 1, the next one down to 5, the next-to-bottom one to 4, and the bottom one to 0.
6 of 6: Once they're all set, click on the ACCEPT button that's beneath the keypad display to open the door.
