Collect crystals as much as you can. And collect trash character here, they kind to give all HERO char and always old character. New character they show just a fake cover. That what i see it. Your hardwork, your time finish the mission, your cash, everything will gone without meaning. So even you add more diamonds to collect, i still feel disgusting to collect it. Because you dont know how to make player happy after the finish their hardwork playing your game.