Creep-realism with great music. I particularly like the puzzles in this series. This game has good cascade which puts it several cuts above your average escape game. There seems to be a small hint of mythology but mostly this is just clear cut puzzle solving in rooms that look like they belong in the movie Se7en. A beginner could hold their own in this series because the puzzles start out very straightforward. A seasoned player will quickly advance to the more challenging levels.
Something unusual about this game is that you are timed. In the very first puzzle, this adds a very strong element of suspense. As you continue through, your finishing time on each level is recorded and measured against other players’. Kind of fun knowing what percentile you’re in.