Swim against other players and try to spear them.
Hit other players to grow your mace.
Survive as long as you can if you are not infected. If you become a zombie try to get the remaining humans.
Choose a character and bash as many players as you can.
Swim around as a jellyfish and grow as large as you can. Avoid other players.
Command your tank against other players and bots and try to take them out.