I believe both TIM and Chip's Challenge are available on Archive to play in browser. The first game I remember playing on my own is the first Commander Keen. I

I believe both TIM and Chip's Challenge are available on Archive to play in browser. The first game I remember playing on my own is the first Commander Keen. I was very proud of being able to start and run it on my own from DOS (I was 3; using a text-only input mode is difficult when you're pre-literate!)