While I am not a connoisseur of hockey by any means, I have always been amused by how few players there are on ice relative to the typical roster size. A NHL roster is 23 players and there are 6 players on the ice at the time. For reference, NBA rosters are 14 players for 5 players on the court. Soccer is less comparable as there are not rolling substitutions, but it's generally 11 players on the pitch and 7 substitutes. The rule change I propose is to increase the number of players on the ice to 10 (9 skaters and a goalie), with rules inspired by the sport of lacrosse; defenseman and attackmen cannot cross half ice, midfielders cover the entire rink. The rink would be scaled up 33% in all dimensions to account for the additional skaters on the ice at all times, and overall rosters would increase to 32 as well. This change would probably be terrible in practice but I have been watching a lot of box lacrosse this season and I was inspired by watching lacrosse pretending to be hockey, so I would love to see hockey pretending to be lacrosse.