Its got a good incentive(kill zombies with others and get money for weapons) but it needs a bit of fine tuning. It doesn't explain how the game works only the controls. It doesn't tell you what money is. And if you want to buy an upgrade you have to get at least 1500 points just for one! It's impossible to do anything!!
 "Obey the Game"){kind=icon}
 "Level Up!"){kind=icon}
 "Zombies! Apocalypse - MMO Zombies Massacre"){kind=icon}
 "Diesel And Death"){kind=icon}
 "William and Sly"){kind=icon}
 "Morningstar"){kind=icon}
 "Penguin Massacre"){kind=icon}
 "Stickman Madness 3: Stronghold"){kind=icon}
 "Understanding Games: Episode 1"){kind=tracking}
 "UPGRADE COMPLETE!"){kind=icon}