Britain is rife with crime and you are leading one of the United Kingdom's five most notorious historical gangs, competing for dominance over London, Birmingham, Manchester, Liverpool and Glasgow. You and your fellow players vie for control over the major cities of Britannia by spreading your mobs, collecting payouts, and using secret intelligence to advance your influence.

Gangs of Britannia is a game that has been known to test even the strongest bonds between players. The game relies on a unique face down 'Prisoner's Dilemma' mechanism that determines between a deal or deception of your fellow players. If all players choose to 'deal', then they are all rewarded moderately and equally. If exactly 1 player deceives, the deceiver destroy enemy mobs and strengthens their own gang. But if more than one player deceives, then all deceivers lose out and those who chose to deal stay out of the fray. This prisoners dilemna mechanism is combined with secret information, where players have intel on bonuses and penalties in cities which they can use to their own advantage and also to mislead their opponents.

In a game where luck decides little, carefully pick who you're forging deals and alliances with as betrayals can lurk behind the next card. One thing is certain amongst the Gangs of Britannia - trust is slowly built but quickly broken...