at the starting levels this game is awsome ... u can actually spend more and more hours every day ,at the point that you realize that after u get high level u are forced to spend some money even though you can actually not to ...but if you dont and not upgrade your vehicle then you will just waiiiit and waiiit till yur survivors cpme back from raids or even simple loot runs and tasks .On the other hand its one of the best survival strategy zombie games and there are tons of stuff to explore and actually use ,although as you progress you will have to wait 2 days for a storage upgrade ! fcked up