Zarf also invented the game Capture the Flag With Stuff, played twice a year by hundreds of people at Carnegie Mellon University.

Current rules (2017 edition): http://www.cmukgb.org/ctfws/

Zarf's original rules (1995): https://eblong.com/zarf/capture-flag-rules.html

Harvard's spinoff: http://www.hrsfa.org/photos/lotze/ctfws/harvard-rules2.html