Keep your tower (school bus) alive by sending survivors out to kill attacking zombies and clear the stage road block so your bus can move forward, thus beating the stage.Different stages have a different mix of enemy zombies that need the right deck of troop types, buffs and luck to beat. Timing and strategy are important. Very painful penny grind to play for free. Difficult to win even if you pay, unless you're willing to drop a fortune gambling for material to max out your troops and buy new types. Have a bad feeling that you will hit a wall fast even if you whale. Online game that gives you fuel to play, coins to buy new troops and level them up and some mats if you watch ads. There are daily sales. No multiplayer. Needs good enough connection to watch video ads to work. Expect to lose everything if they ever pull the plug on the server.Spinoff of Dead Ahead, which was, quite frankly a lot more fun, if only to hear somebody yell "Killing Spree", every few seconds. Honestly, I just get depressed seeing the troops i spent good money to buy get slaughtered and reanimate to tear me to shreds. Even when you win, the rewards are pitiful. You don't feel like you're progressing.Similar to Metal Slug Defense, which is years older and still the best tower defense on mobile IMHO. That's the standard i hope this game can reach someday. Not holding my breath. At the very least, make this game offline before you pull the plug on the servers.Edit: Make sure to use up all your casino spins before updating. They took out the casino. Thanks for the lack of a heads up. I lost 84 casino pulls I was saving. Sigh.