I don't know if it's just me or not, but the barriers don't regenerate their health like the buff says they do. This makes those challenge modes ridiculous.
Final Update: I was able to complete mission 9 challenge by using a sawn off and double mining/moltoving the crap out of the zombies. It's a fun game, but be prepared for balance issues, difficulty spikes, and a few bugs. 4/5
The boss decayed and challenge, and mission 9 challenge are nearly god dam impossible even with maxed out weapons and 72/75 stars. Barricades on 2 side levels don't repair and Bombers don't actually deal any damage to your car/barricades. 4/5 for balance issues and a few bugs.
yeah but you don't know if it's facebook or paypal or whatever