Cells with sliding doors. On top of that, these doors got interlocked in a way even the guard can’t figure it out. But is it really necessary to fully open doors to escape? In some prisonbreak movies, roofs and cellars play their part. Could this be the case here?

Help them, or they will remain jailbirds forever!

Free the 4 inmates...but note it’s a complex path to freedom that will require more than 30 steps.