The Arena is the last game unlocked in Kirby Super Star. Here you will battle all the bosses in the game, two teams of mini bosses, and a singluar Waddle Dee, coming to a total of 19 battles, in random order (the last boss is alway Marx, the hardest boss in the game.)
Between battles the Player may change their ability with one of the two random ability stands. The Player may also use any of their five Mixim tomatoes to heal; it is a good idea to conserve them because you only have ONE life. The good knews is that before each battle in the top right corner of the screen you will see who you are fighting next, and therefore have an idea of wether or not you really need to heal.
Successful completion of the Arena will open the sound test on the game select screen, which allows you to listen to any sound or song in the game. You will also see how long it took you to beat the arena.
These are the Bosses you will face (again, in random order except Marx, who is always last):
Note: Lines containing more than one boss mean that you will face all of those (mini) bosses in a row without access to your Maxim Tomatoes.