Dont waste your time playing this game its full of bugs and very costly for upgrading items you have to buy material with real money they force to buy even if we buy any box the rank L percentage is only 1% from 10 valentine's box didnt receive even one rank L if we upgrade ourself always fail 40 items back to back fail while upgrading to rank L why its fail you can raise its cost to 20M but every time failure will be bad experience for players thats why i dont want to play and uninstalled it