This was a five star game until the introduction of Dungeons. It was intended to replace Co-op which was a never ending challenge to see how far you could get. Rather than add Dungeons and keep the original Co-op, they eliminated it. Now the game is far too easy and extremely boring. Dungeons were a fine addition but should never have been used as a replacement. Instead both should have been kept allowing us more options and encouraging players to develop more than 5-7 units.