It's a fun game but also just as brain dead as the zomibes in it. The economy of the game is silly. You start with paying hundreds of money units for upgrades. Soon you pay billions for a set of tires and fuel.  Game progress is frustrating. First you upgrade one vehicle to its finest. Then you finish that level, and get a new "better vehicle" with no upgrades. In what universe is that non-upgraded slow and fragile vehicle better than the one you just pimped out? Every level feels like you're starting the game from the beginning.  In a nutshell: 1) drive as far as you can, 2) watch an ad every third time, 3) buy an upgrade, 4) repeat steps 1-3 until all upgrades are bought, 5) pass the level, 6) repeat steps 1-5 for all ten levels.  I did grind through the story mode and expected free play and other game modes to give something more. A big disappointment after realizing it's all the same but even more pointless. Although, in free play you can play early stages with later vehicles. Problem is that some of the vehicles are so big that they don't fit into tunnels etc. and thus makes the levels impossible to pass.  After the story mode I see no point in playing it anymore.