Back in the dark ages of computing when GUI sounded like something you ate rather than looked at, one interacted with computers by typing commands. As you can imagine playing computer games was a bit of a challenge. What did become popular are role-based games that you played typing in commands. Infocom was a company that produce a number of these games like Zork that I remember playing on the Vax in college.
If you're an old guy like me and appreciate a walk down memory lane every now and then yon can play these old games using AOL instant messenger. Just send a message to InfocomBot. You can buy a copy of AIM for Pocket PCs at Handango.