Lost Halls of the Drinn is a custom dungeon for Legend of Grimrock that I made in 2014.
There's a lot to be embarrassed of - its writing is utterly vapid and doesn't offer a strong message, it has poor art direction and is just plain ugly in many places, the pacing is bad, and it keeps far too many pointless mechanics from the original game.
But it has some puzzles and fights and sound design that I still like, too, and it was received very well when it released.

Download it! (Version 1.0.0) (Source files)

Screenshots: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

If you're stuck, check out the hints and solutions page.
Can't figure out how to fight a monster? Look at the monster spoiler page.

This page is content-oriented.