Mineforgian
It's a map originally created by Zelvac, an old french minecraft youtuber back in 2013, it already have been updated by Gringer1100.
this map is a survival where you need to build a tower from the floor of the ocean to the build limit while staying on the 7x7 platform, il you go out, you lose. there is a lot of goals, they are all detailed in the map.
my discord if you need any help : Leufan
Good luck =)