In Sumo.io, you get to steer a sumo grappler. You and your foes are confined to a circular area, and you must force them to leave. If you're successful, you get to go ahead and claim victory.
The arena will feature a display of candy. Your fish will flourish if you eat them. He'll be in better shape and have a greater chance of victory.
The objective of the game is to eliminate all other players. The more one is pushed, the stronger and more resistant one becomes to further provocation. Having this advantage can give you the upper hand.