This is a fun 3 on 3 game that works well if you have 9-12 players (not including goalies) . For younger teams you could make this a 4 on 4 game as well. It is a typical 3 on 3 game where the teams play until there is a goal. The team that scores stays in the game and the losing team is replaced by the bumpers that are aligned on the blue line. The new team is the only team allowed to use the bumpers, therefore giving the new team a distinct advantage over the winning team. The idea is to move the puck to your advantage when the bumpers are available. It also levels the field of play so that one team is not always staying in the game.
In the diagram, if the yellow team scores then the green team will replace the blue team. The blue team then lines up on the blue line and are available for passes from the green team.