Dito on what BDD said.
Rules: Not like ice at all.......
Concrete with a roll-on surface or sport court. ( there is a local outdoor rink that is asphalt with a roll-on coating applied to it.......It has surprisingly good traction!
)
Puck not ball (at least where I've played)
4 0n 4 (already stated)
No check......well in theory
No off-sides
No icing
No blue lines, only a center redline. (elimnating 2 line passes......dang cherry pickers!!! )
Full gear for goalies is a must, well in my book anyway.........unless you like getting all bruised up.