An in game development would be good as well. like some balls or pins that you might unlock with out paying for them. not indicating get rid of the dollars shop, (I are aware that's essential for the free game) but some type of development would help with player retention. https://free-online-game22156.pointblog.net/a-review-of-free-online-game-strike-bowling-king-3d-bowling-70024782