Dark Angels is the first hidden object I've played that flips the script and gave me the objects I would normally try to find, and said 'put them back in the scene where they belong'. It's not like, groundbreaking master level puzzling. But after many hidden objects where its your standard "Here is a list of things, click around and find them" you load in to a scene with a full inventory of stuff and you have to put everything back.

I've ran through Dark Angels and started Sacra Terra, which don't seem to be the buggy ones. So maybe this review will change later.