The Late Bronze Age official Print and Play expansion consists in a set of additional rules and a new score sheet, downloadable from the Roll Through the Ages website (www.rollthroughtheages.com). The new rules add 4 developments (Preservation, Smithing, Shipping, Commerce), change the cost and reward of 5 other developments (Medicine, Religion, Granaries, Architecture, Empire).
Trading between players is now a base rule, and a player who completed the "shipping" development can build ships that will allow resource conversion.
The Late Bronze age expansion answers the requests for a longer play time and added interactivity between players.