In Dishonored 2, you can peek through some of the keyholes to see what's on the other side (such as guards, patrols, etc) before going through that door, so you are strategically prepared to deal with any threats awaiting.
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Strategy Guide/Tips
- While peeking, you can often also here the conversations that occur on the other side of the door, which may be give story insights or maybe even clues for progressing through the game.
- One of the first keyholes you encounter will be at the beginning of the game, when locked inside the Imperial Chambers of Dunwall Tower.