>found that my game had somehow spread to that school as well ... I wonder how many other programmers of our generation had this experience.

Similarly, my little brother inherited my Ti-83+ and spread all the personal software I had written to his entire class: a simple kinematics solver (byebye thinking about intro physics homework), blackjack/21 (Vegas dealer rules, no splits), and several chemistry homework utilities.

Needless to say, teachers were not impressed with my/his cleverness.