This is a bad way of handling a btd6 version of btd battles, the xp system for towers is a horrible idea, and takes far too long to unlock any upgrades by the time you are forced into a higher arena, which you are NEVER forces into on btd battles. also too heavily monetised thru "seasons" for such a new game. Plus, VIP is basically a p2w purchase as it allows you to level much quicker, and worse yet it's like a renewable subscription, disgusting.