This document discusses lessons learned about effective gamification in the enterprise. It argues that work already involves games but they are often poorly designed. The key lessons are: 1) Gamification requires a careful design process, not just adding features, 2) Design should focus on intrinsic motivations like meaning, autonomy and mastery, 3) Positive existing behaviors should be amplified through easy and social designs, 4) Changes must be made slowly and carefully to avoid unintended consequences, and 5) Simplicity is important for adoption and impact. Game elements can backfire if not properly implemented based on human behavior in organizational contexts.