Board Game Arena

I am a bit surprised to see that Lake was voted-in for the new Arena season. And disappointed. It really ruins it, for me anyway. I feel the Arena should really be the base game, purist, and not sure if I'll play/subscribe further now this Arena season. We'll see. Mini-rant over

Yep, I started several turn-based arena games, and now I have no idea what these extra tile things do.... trying to find the rules online