How could you have missed: https://en.wikipedia.org/wiki/Colossal_Cave_Adventure
I have a copy of the original source code printed on the fanfold sheets from the original system it was created on, in all its fortran glory. By most of all us oldies, this was one of the earliest games on a computer that actually sparked the attention of the science communities. We used to play to compete for the fewest moves to solve the game, as late as the late 90's. It is still a fixture at many universities. Tic-Tac-Toe was a logic test and not considered a game as it had no solution to win other than user error. Adventure was a game, designed as a game, to be a game. The first to carry that distinction.
From 1990 to 1993 my high school had two computer labs. One was filled with 386's running Windows 3.11, the other was Apple computers. The Apple IIe to be exact. At the time, I was only a few years older than those computers. They did have some fun games though.