If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Become the ruler of the arena. Beat the opposition to a pulp and chuck them out of the combat zone. The more damage you inflict upon your opponent, the easier it will be to get rid off them.
Anything is permitted so don’t be expect a clean fight. Use the unique fighting moves of each character to become the new champion.