Two great 70s pastimes: hacking mainframes and hacking dungeons. Graeme Davis took the graph paper route, an unbounded system with no documentation, orcs on the outer levels and an evil wizard running as root. Both got pwn3d by teenagers. https://www.tabletopsentinel.com/columns/when-dice-were-made-of-flint/when-dice-were-made-of-flint-3