The main changes of revised 2013 version features are;-
1) A die has been introduced to determine play choices which are:-
a)Bid for an era card or b)take a thunderbolt ( chance card)
or c) carry out volcanic actions using a personal volcano(cone). Each player now control his own cone ( game now contains 6 cones).
2)The main pack now has era cards only which may be acquired by bidding using tokens. The winner (highest bidder) of any contest has to give up tokens according to the number of tokens bid by the next highest bidder.
3) Each player is now dealt a personal hand of two era cards at the start. Bidding against a single opponent for an era card in his hand is now allowed.
4) Exchanging era cards ( from personal hands) is now allowed.
start cards have replaced the board to allow more flexibility in the required playing area.
5)The penalties shown on the thunderbolt cards are linked to the symbols on the era cards.
6) Ending a turn now allows options to move up to two moves sideways as well as one move forwards ( or backwards)
source : super-apegames limited (publisher)