How attentive to details are you? The very best founders & builders I know are not only great at guiding high-level vision, but are also very meticulous about small improvements/bugs. Your goal is to catch as many software bugs in this game as possible, and see how you stack up against other founders, engineers, PMs, QA testers!All the code is open-source on Github. If you're a CS student/junior engineer, it could be a good reference for building your own side project.