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Small MinSec prison

well, with min sec you can basically do what you want.

Some things that come me to mind, as a player who builds for effectiveness instead of beauty:

your always are 3 tiles wide, while your doors are just 1 tile. This will cause crammed entrances.

Also your prison has quite long pathways to get anywhere:

your prisoners need to go 20 tiles to the right and then 10 tiles to the left again, just to get into the canteen. If somebody tries to go from canteen to common room it gets even worse.

so yeas, i would put in some more doors.

oh and technically you dont need a shower room, i personally put them into their cells.