Nucleum: Australia comes with a new map that introduces several new concepts and rule changes to the Nucleum base game. Use shipping lanes to expand your networks, build your own coal mines, and try the expert variant with bidding for the experiments.
Why do you absolutely need it?
A NEW MAP THAT REQUIRES REINVENTING YOUR STRATEGIES TO A NEW GEOGRAPHY AND NEW MECHANICS
INTRODUCTION OF SHIPS, NEW TYPE OF CONNECTION THAT ALLOWS YOU TO EXPAND YOUR NETWORK FASTER USING NEW PLAYER WOODEN PIECES, BOATS 
COAL MINES ADDING ANOTHER OPTION TO UTILIZE INDUSTRIALIZE ACTION. OWN YOUR PERSONAL COAL SUPPLY THAT YOU CAN USE FOR FREE EVERY TIME YOU ENERGIZE AS LONG AS YOU CAN CONNECT IT.