This document outlines 9 ways to ruin an open innovation challenge. It discusses common pitfalls such as launching a challenge without clear objectives, figuring out rules as you go, not properly recruiting participants, setting high barriers to entry, and keeping intellectual property rights to yourself. It provides tips to avoid these issues such as being transparent about rules and IP from the start, lowering barriers, and recruiting widely. The presentation encourages being open, organized, and generous to run a successful open innovation challenge.