Video games were invented in the latter half of the 20th century. Meaning that their subject matter is, more often than not, set in the 20th century (or later). But if they'd been invented earlier...
We'd (hopefully) have ended up with games like these! WARNING: some of the pics after the jump, which were entries in a competition over at Gizmodo, deal with questionable stuff. You know what? History is full of questionable stuff.
65 Ancient Video Games I Wish Existed [Gizmodo]