I am lost :( .
When I was >1, my dad used to hold me while he worked on the computer, occasionally playing Wolf3D. I eventually figured out what he did to play the game, and he let me play it at one point. After than, I learned the DOS commands to get into DOOM. At this point I already knew how to break out of my crib, which was in the same room as the computer. According to my father, he came home from work to find me out of my crib and playing DOOM.
This is based on assumption and what my parents told me of course.