Absolute grind-fest
It's F2P, so some grind is expected, or at least microtransactions, but this is another level.
What's the fun in having to lose over and over again with towers you have no XP for, in order to get them up?

Absolute grind-fest It's F2P, so some grind is expected, or at least microtransactions, but this is another level. What's the fun in having to lose over and over again with towers you have no XP for, in order to get them up?