1648 seeks to portray the "Concert of European Powers" following the Peace of Westphalia. Players assume the role of European statesmen seeking to outclass their geopolitical rivals and attain a position of predominance.

The game is based upon Allan B. Calhamer's classic Diplomacy. However, its treatment of minor powers is strikingly different as these have their own military units. Players secretly bid influence points in order to obtain the support of these lesser powers.

The rules and maps are provided further below.