One of the best games I've ever played in years. The graphics are nice the game is so addictive. Everything is so easy to understand and to the point. But unfortunately after a while you realize that it's a paid to win game. The game loses its balance and you get stocked in missions with over powered and amazingly strong zombies and bosses. You gain so little that you are not able to level up a unit or buy a stronger one. I'm so sorry to see that the developers are ruining such an amazing game.