You MUST spend to continue to advance in missions. They say spending makes it easier but it's not necessary, WRONG. Unless they remove the tag team arena requirements for mission advancement, myself and many clan mates will never advance. We will never beat the big spenders. They have added another level of Arena and made it WORSE! It was looking so good, now they just keep driving players away. Unless you want to spend BIG, pass. If you want to spend thousands and still lose, this is your game.