VigilanteG 15

Once you have freed a Jinjo from a prison, that prison will remain empty until you find a Minjo, smack it with your wrench, and carry it back to the jail. Minjos are quite small and difficult to see at times, so explore the general area around the various jail cells and listen for an evil cackle. Once you hear it, look very closely at the ground as you move around the area, and eventually you should see the little bastards scurrying around. They can be tricky to smack with your wrench because they turn on a dime and you can't perpetually swing your wrench, but they aren't super fast, and they stay in the same general area without disappearing. Just keep after them and you'll smack one eventually. Once you do, a marker will appear to guide you to the nearest empty jail cell.