This document discusses how to effectively monetize games through advertising without negatively impacting the player experience or cannibalizing paying users. It notes that only 1-6% of users typically make in-app purchases, so advertising can monetize the remaining 98% of users. The document provides tips on choosing appropriate ad formats and placements to avoid interrupting gameplay. It argues that ads can act as "enablers" if implemented thoughtfully and that they increase engagement, retention and the potential for non-paying users to convert. Examples from mobile games and social networks are given to illustrate how ads have become a meaningful revenue stream without compromising the core experience. The overall message is that direct payments and advertising can successfully co