The game is set up to track up to 4 people but it only comes with 2 smurfmeters. Nintendo is probably going to sell the smurfmeters as standalone eventually. They probably want to see the sales figures on their $50 package first. If they decide not to sell standalone meters, they would intentionally cripple their legitimate users games down to 2 people per cartridge but prevent the pirates from just buying a meter and downloading the game. Hopefully they will decide to sell standalone meters if only to have replacements ready in case someone breaks their meter that came with their legitimate copy.