Steam: Map Expansion #4 brings Steam players to two new parts of the world. In South Africa, 3-6 players will need to focus on mining as much as they do markets. The Poland-based expansion promises "Broad to Standard Gage Transitions" and includes two sets of rules: one for 3-4 players and another for 2 players. Steam: Map Expansion #4 also includes a new tile sheet for use with these game boards as well as additional tiles for Steam: Map Expansion #3.