Don't build boilers inside of a building, they provide a lot of heat which can't be controlled. Build them outside instead.

Unfortunately you can't assign a room to two different groups at once. (Like min und med security prisoners) One way you could achieve that would be by providing two entrances for the visitation room, with a small room in front of each - one tile is enough. Assign these small rooms to only min resp....

In general, I don't have trouble keeping the peace in my prison by separating the prisoners and providing enough guards. Gang leaders on the other hand are tricky. They often tick out for nothing and go into a killing rage. And putting them into solitary or any other punishment will set the danger l...

Actually, it's not too hard to stop tunneling. The best weapon against that is a good amount of informers, the wide use of metal detectors and a large enough distance to the outer wall from your cells. With enough metal detectors, only the wooden pick axe remains as possible tool for digging. And th...