I have played these every once and awhile and you are right they do exercise your brain. Especially the ones where the clue to the item is a riddle you have to figure out first instead of just listing the item. The last one I played was a version of Mystery Case Files.
There are a few games like these online but I get bored after a wile. Xbox games are much, much better. Or first person shooter games, they are my favorite, I've been playing those for years before I got my Xbox.