It's weird they stopped at those sports. Based on the similarities (2 teams trying to move an object to a 'goal' on opposite ends of a playing surface), 90% of team sports are the same. US Football, rugby, water polo, ultimate Frisbee: all the same sport. Then other major team sports would be tennis/volleyball/racquetball/badminton/jai alai, baseball/cricket, and curling. So there are really only 4 team sports I can think of.