Try A 40% - 60% Mission (Chicken invasion/Dark misson) Duration 2x5 (or more)with all wave get clean sweep (Only a Wave that possible to get clean sweep) Using any dificulty beside tourist and rokie.
Try A 40% - 60% Mission (Chicken invasion/Dark misson) Duration 2x5 (or more)with all wave get clean sweep (Only a Wave that possible to get clean sweep) Using any dificulty beside tourist and rokie.