This document discusses mobile game apps and app store optimization. It provides information on three very popular gaming apps: Sushi Chain with 3 million users topping charts in 8 countries and 18 countries, Infinite Sky with 2.5 million users topping charts in the UK, US and 44 countries, and Train Legend gaining 200k users in one day and topping charts in the US and 31 countries. It then discusses strategies for optimizing apps, including focusing on users, targeting non-English speakers, using email marketing, cross-promoting apps, asking app stores for features, and exploring all the opportunities across app stores.