I don’t know where I got it, but I remember having access to a Life program for the PET written in 6502.
It was basically a hex dump as I recall. And it was not a short one.
It’s notable because I typed the thing in twice, once with a friend to help ensure that we got it right, but in the end it never worked. It never did anything. And we had no idea what we did wrong.
But I was motivated enough to do it twice.