Pay to play. Not stable because the game will lock up frequently. If you don't pay, your shots ricochet or don't penetrate, and enemy tanks can hit you easily. I have a heavy tank with level 10 gun hitting a level 8 medium tank in the side and it will ricochet. Then they hit me head on with no problem. May be free, but your algorithm changes the rules. My average, winning, and shots increased significantly once paid. Facts do not support your claim. Your algorithm allows better odds for paying.