Can't they just make the extra bits a free. Like Learn To Fly 2 where you have to actually complete challenges and then you get the Bonus Pints to buy the extra items. Just a suggestion, but it would be nice considering most people don't want to pay.
 "Zombie Cube 3"){kind=icon}
 "Shopping Cart Hero 2"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Learn to Fly"){kind=icon}