Its 100% pay to enjoy game and its not a zombie game, so i had to quit due to constant attack from top alliance. You are left with crumbs and healing the soldiers cost lots of resource. How are you suppose to upgrade your base with this constant unlimited attack devs? Stupid event like those on Sat and Sunday is what making everyone quit. Put limits how many times your base can be attacked per day and you can probably make people stay in the game..