I developed an MMO gaming engine that was an over head 2d flash game. It had zombies, survivors, shooting guns, lots of weapons, flame throwers, side missions, lag reduction algorithims, and anti hack check sums the game was open world with vast levels to explore.  Right when i was about release it facebook scraped the option to allow credit card and put in their policy that any one not using facebook credits would have their game removed so i made my own website to facilitate alt payments of course scince it wasnt on facebook any more no body was interested and all my beta testers dropped off and everyone lost interest. Lol no im kinda mad i didnt save my code now that they brought the policy back to normal. Maybe illl just use jmonkeyengine next time instead.