But even that market has suffered an attack of investor nerves.

ECONOMIST: The extraordinary edginess of crowds

The rise of social networks, for example, has aided an increasingly common kind of attack known as spear-phishing, says Greg Bell, global service leader for KPMG's information protection practice.

WSJ: Tech Companies Struggle to Keep Hackers at Bay

Player one has 30 attack worth of monsters that each hit for 5 damage on an attack and 100 energy.

FORBES: Zynga's War of the Fallen Is A Refined Card Battler