This is one of the best games out there, very unique. Definitely not a cash grab, as I have reached level 15 (1st Lieutenant) without putting in a dime. I plan on spending some money soon because the developers have earned it, but not because I have too. It does take time and patience. I play maybe 15 minutes a day, earn all the objectives and rewards I can for the day, then call it quits. It's kind of relaxing. By doing that, and leveling up things smartly, you can beat the zombies, even though it's getting tougher. Or just to relax, you can blast away at an "easy"setting just for the fun of it. Graphics are great, especially when you zoom in. There not a lot of instruction on how to fuse weapons or what the different weapons do, but you get the hang of it. Go for purple, then blue then green. Ask Rufus, he knows. But watch out for the royal ugly dudes. Party on!!!MANY PINA COLADAS LATER....Like two years later, and I am now a level 40 FiveStar General and never had to put in a dime (sorry Devs; I will one day, I promise). It’s my second favorite game of all time, right after World of Tanks Blitz. But I have to say Zombie Gunship is still relaxing, while WoT is anything but. Give this game a chance, and just play for fun, and you will advance. Have not been able to beat the really big crane- sized zombies yet. I think I’ll need small tactical nukes for that.