Lot of people are noticing the hidden changes you are doing to the zombie bases and not disclosing this to the players. Players were able to do this with free repair, now there are things just giving massive damage and NOTHING is actually hitting units. Just down right wrong and shameful. Glad I have spent 0$ on this game so far.
0
Says it right under Event Structure.. This has been in play for a while now that they difficulty does ramp up with each play through.