Reward ads do not pay out 80% of the time. Shoppe reward ads do not pay out. Too many forced ads. Every minute, I get hit with these asinine ads that do not close, slow down device, and last anywhere from 15-40 seconds each. Even when ad stops playing, it refuses to close unless I press the purchase or install buttons. So you drive, run over objects, smash zombies, crash, sent to garage, FORCED AD(s). Devs owe me a lot of vehicle upgrades, enough to fully upgrade one vehicle. fun game otherwise.