its a good game to play but is there is a 5th one there should be a thing were you can click on a unit spell or titan and hero if you click it you should have a thing were you click and and all the money you earn it should take the amount of that you earned and the price will go down
 "Interactive Buddy 2 (Prototype)"){kind=icon}
 "Epic War 4"){kind=icon}
 "Bloons Super Monkey"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}