Captive Minecraft is a map where you try to get achievements to expand the border.
So far Captive Minecraft 1,2,and 3 have come out.
It’s very easy to get them no mods or anything!
All you have to do is download the map and go to minecraft
pick edit profile and open DIR go to saves and drop
captive minecraft there.
Go back to edit profile turn on expiremental snapshots and pick 14w28b.
Then go to minecraft and single player and captive minecraft
should be there! 🙂