Most recent one we did was the
space theme one at Escape Hour. It was advertised as the hardest room in Calgary. They said 10% completion with hints. But meh we got out of it okay. We needed one hint I believe.
The room was really well done though. Well decorated. Some cool uses of video and sound. Puzzles were tough, but logical. In other rooms I've done, the puzzles can just get insanely obscure, but in this case most of the puzzles were fun and reasonable.