The Tartarus Key

If you're allergic to puzzle games, though, it's not a gentle introduction to the genre. Depending on the ending you get, it might feel a little abrupt at the finish, but there are some puzzles in there that feel revelatory to solve. You feel smarter than one of those sheltered Mensa kids whose parents force them to learn to play the tuba. I figured out that bit with the blood serums, godammit, I should be eligible for lifetime membership of your little genius-person club without any tests.