I had a very similar experience with Nibbles. It was my first time reading a program and modifying it. The initial motivation was that we'd bought a new compute

I had a very similar experience with Nibbles. It was my first time reading a program and modifying it. The initial motivation was that we'd bought a new computer and it was suddenly unplayably fast. Found the busy loop that slows things down and added a 0 to the limit. From there my brother and I started modifying other things, adding levels, etc...