Dont start playing game! $1000 cost for a 2% attack bonus! Developers out of touch. They create new upgrades and contest for spending money only. Very little events to allow players to use upgrades. Now they came out with new technology in last two weeks, that cost $17000 USD to purchase. You can not progress if you are free to play. Attacks now lose 800k+ troop! Developers give you nothing. They even limit redemptions on small free packs they give out. Many quit playing. This game is garbage!