These days, many folks may not remember that the first computer games were text-based, as were the first multi-player on-line games. I remember one of the old No*Name BBS. I never played it, but I remember it.
Wikipedia describes the first computer-based adventure game here.
There is a flash versions of Colossal Cave here, so you can get a feel for how it worked.
And here you can find it applied to contemporary events, with devastating and hilarious accuracy.