Patent ID: 8480498

Claim:
A multiplayer game system comprising: a first machine executing a video game with a predetermined sequence of game objectives, each objective to be met by one or more players in order to progress to a subsequent objective, the first machine tracking a first mission progress line for a first player including which objectives have been met in the video game, at least a portion of met objectives of the first mission progress line occurring during a first time period; and an interface for a peer-to-peer network, the first machine enabled to receive information through the peer-to-peer interface from a second machine executing the video game and tracking a second mission progress line for a second player, the second mission progress line tracking which objectives have been met in the video game, at least a portion of met objectives of the second mission progress line occurring during a second time period outside of the first time period and during which the first and second machines are not in communication with one another, wherein the first machine is enabled to synchronize mission progress of the first and second players by updating the first mission progress line with a union of a set of objectives that have been achieved by the first player and a set of objectives that have been achieved by the second player.