General hint:
Be careful what you do, as some actions cannot be fixed.

Hint: Disarming the bomb:
To disarm the bomb in Zeitel's room, set the left switch to #2. Next, set the middle switch to #3. Then, set the right switch to #3. Wait until the clock goes off, then set the left switch to #1. Open the case with the key in it. Get the key and click "OK". Finally, exit the room.

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