If your opponent’s checksum matches yours, then you are ready to play.
The quickest way to verify that you are both using a compatible version is to consult the “checksum,” that four letter code following the version number at the bottom left of the main screen. If any of the players have a different checksum, their games are incompatible and the multiplayer game cannot be started.
Players using the multiplayer game features need to compare their games to make sure that all players share the same checksum.
The player may need to reinstall the game in order to achieve the correct checksum. If, after launching the game, a different checksum is shown compared to what is expected, the player knows that their copy of the game may be missing key components or is corrupted in some way. Players can check the checksum to ensure their games were installed correctly. The checksum will appear in the lower left corner of the main screen next to the version number.
