How many times can master key be used?

Can you use master key multiple times?

Yes, it can, but its not all that useful, since most locked doors have to be opened from one specific side.

Is the master key reusable?

Master Key Usage Reusable key that can open any door with a simple lock.

Is master key single use?

The only uses it has after this point is in Sen's Fortress to free Big Hat Logan and obtain a Soul of a Hero. However, the player will keep the Master Key when moving into NG+, allowing them to use it in the next playthrough.

Can master key open any lock?

When lock rekeying into a master key system, two keys are created: Change key: This key can open the master lock, but only the master lock. It cannot be used inside any other locks you have. Master key: The master key can open all locks you have in your residential or commercial property.