Bow Street Runner: Flash game tries to bring law to the mean streets of Covent Garden in 1750

Bow Street Runner is a Flash game from Channel 4 that plunges you into the grimy, crime-ridden streets of 18th century Covent Garden and asks you to join the goon squads who tried to impose order on the city. It's full of historically accurate, Deadwood-grade foul language and squicky details.

Bow Street Runner is set in London's Covent Garden in the 1750s. With crime and vice running at very high levels, and before the organised police force existed in England, local magistrates formed the Bow Street Runners and began to impose law and order.
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(Disclosure: My fiancee commissioned this game for Channel 4)