WWII tank FPS
start out with the basic tanks, as you earn points you upgrade the tanks and then get to upgrade to a better tank.
You also can get Tank destroyers and artillery.
when you hit the "battle" button, you are sent into a server that's 16 vs 16. 10 minutes to either kill the other team or capture their base.
If you die, you can log out of the battle but your tank stays in that server til it's over and you gain points for it, so you don't have to sit around waiting for the match to end, you can hop onto another of your tanks and go right into another match.
Game itself is free. How they are doing it is if you want to have a premium account (gives you a bonus to exp. and points) you can buy gold any time you want. You don't need gold to play though.