This is a survival horror mod made by one of the original developers.
For those who want to install manually, extract the .dat file from the archive to C:\Users\[yourname]\Documents\Almost Human\Legend of Grimrock\Dungeons\
You have to go to Grimrock's preferences in Steam (works for Steam only right now!) and switch it over to the public beta. It will then update itself, and you'll have options for playing a custom dungeon, as well as a dungeon editor, on the title screen.
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For those who want to install manually, extract the .dat file from the archive to
C:\Users\[yourname]\Documents\Almost Human\Legend of Grimrock\Dungeons\
A small description would be nice at the info panel too