This document outlines six key learnings for building successful games from a company with 50 million active users and a team of 200 people from 30 nations. The learnings are: 1) Get the core game loop right before adding features, 2) Don't solely follow the opinions of highest paid people, 3) Use metrics from testing to improve the game, 4) Focus on ongoing engagement to extend the game's lifespan, 5) Prioritize the best ideas over just good ideas, and 6) Social mobile gaming is the future given its growing popularity and monetization opportunities.