66 Rooms III is a sequel and a large scale map that boasted 90 hours game-play.
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66 Rooms III is a puzzle parkour map. It seems that you have to do parkour and solves all the terribly hard puzzles to break through all the rooms.
Parkour itself is already a puzzle, deciding where to jump and creating your own path which is why it took more than 90 hours game-play.
There are two version, for those who has already played version I & II, you may proceed with Normal Edition. To those who haven’t play it before please download Extended Edition as it has needed resource pack.