Each turn in Vikings Gone Wild — a deck-building, resource management game based on the online real-time strategy game — players can either buy permanent buildings sitting in front of them (resource factories, resources containers, etc) or buy units, towers and special cards that improve their deck and offense/defense capacity. The only way to win is by successfully attacking each other, and each attack involves interesting bluffing mechanisms in which the attacker doesn't know the defense capacity of their opponent...