Dammit, I didn't want to do this, but now I need to explain every reason why hydro ball is nothing like Quiddich, because the nerd in me wont let this pass xD First off, there are the extra goals you mentioned. Additionally, in Quiddich, you cannot dive at another player and tackle them causing them to drop the ball, nor are you allowed to punch them xD. There are 4 balls in Quiddich, two of which fly around trying to attack players, as such, there are two players on each team WITH BATS who attempt to smash them at other players. In Hydroball you win by scoring a certain number of goals. In Quiddich, another special player has to catch another special ball to end the game. Don't make me go on, i feel nerdy enough as it is T_T. Frankly, Hydroball is closer to basketball than Quiddich.