Me and my friends solve puzzles only on "hard" difficulty. And we find that difficulty not so "hard". We even find sometimes solutions where only two of three stones are moved (the third stone even not touched by other two).
We request the "Extra Hard" difficulty which can grant at least SD memory cards as rewards.![]()
Far 3 is best of Far Cry titles with its own islands enviroment, super soundtrack, perfect game feeling, but outposts are too easy, there are missing fortresses like in FC4. There should be remastered edition FC3 with new missions and many fortresses and it would be best game ever. I would pay anything for that.
You guys are a little late to the FC3 party - there have been plenty of free maps/mods for FC3 made by enthusiasts.
Still some out there like http://fcmaps.net/maps/far-cry-3
In FC4 there is the map browser integrated for sp/mp community maps - hundreds of maps there fitting your requirements.
If it's "too easy", then switch over to a modded FC3, such as Ziggy's:
http://www.nexusmods.com/farcry3/mods/63/?
in addition to the other suggestions, such as the Master setting and employing your own on-game rules of engagement.