Batman Akam City

The landlord found a big pool with sharks and ice floes. Look at the map, there are four exits.

One just came in, and the other opposite is a penguin character.

On the right hand side of the man who just came in are two policemen who need rescue. In the room after re-entry, there are also the armor of police and frozen people who need rescue.

Just entering the door, there is a door on the left. Go straight ahead and you will find the frozen person. Penguin kept him in a collection room and blew up the wall on the right, so you could use the decoder to rescue the frozen man.