The Room 4: Old Sins

 This was a point and click puzzle adventure that was effectively a big puzzle box.  It was very well made, with enough clues and available hints than I never really struggled with no idea what to do, lots of rooms and things to try.

The logic of the puzzles made sense and they were implemented in a very steampunk fashion, so the mechanics of watching the gears whir to open a hidden compartment in a rolling desk were fun.

One of the better escape room type games I've played!