Fun game but difficult and frustrating

This is a fun game, but you can only progress if you pay actual US dollars to purchase in game items. It gets very difficult and frustrating in the end. Also, the second part of the game, where you play the zombies, is impossible to play and extremely difficult that its unplayable. Games are supposed to be fun and relaxing, thats their purpose. Youre not supposed to get frustrated and bored and spend a sum of money for a 15-minute a day of fun.

ashrafwhelmy about Samurai vs Zombies Defense