Don't just spray and pray. Aim for the heart or brain for instant kills. This saves ammo and earns you higher "Kill Bonuses," which translate to more in-game currency.
Watch the optional ad videos within the game. While simple, they provide free currency that adds up over time for those essential infrared scopes or magazine extensions.
Cracked files are frequently injected with malicious code that can steal your passwords, monitor your activity, or even brick your iPhone.
