Complete Master Challenge and win or lose. Alternatively, have a saved player on the memory paks in controllers one and two. Then enter a two player battle in win or lose mode. Defeat the other player and the beaten player will lose an ability. The winning player can then gain the 9th skill.
Easy victory against the Joker (Master Challenge mode)
Use a knock down attack with any character at the start of each round. Play as the Ninja and keep moving diagonally towards Joker to attack. Keep repeating this, but try to get him the first four times as it becomes more difficult with each attempt.
Fight as Boro
Complete the game under the easy difficulty setting. Note: This character is named Eyvokan in the Japanese version of the game.
Fight as Robert
Complete the game to earn a star. Select "Fastest" mode. Defeat all fighters in less then one minute. Robert the robot will be available on the character selection screen.
Fight as the Joker
Complete the game to earn a star. Select "Survival" mode. Defeat all one hundred characters. The Joker will be available on the character selection screen.
Fight as the Master
Complete the game to earn a star. Select "Master Challenge" mode and defeat all opponents. The Master will be available on the character selection screen.
Fight as Ushi
Complete the game to earn a star. Select "Rodeo" mode. Remain undefeated for at least one minute. Ushi the cow will be available on the character selection screen in two choices of colors.
Kill during victory pose
End a match with your opponent having very little energy remaining, or standing next to a ledge. Stand very close to your opponent during the victory pose to have it hit them, causing a kill or fall.
Pierre's exploding nose
Select Pierre in his alternate costume and begin a match. Repeatedly tap L during the fight to spin Pierre around and cause his nose to grow until it explodes.
Quick health refill
Step far from your opponent when your health meter is low. Then, hold High Attack + Low Attack. The health meter of your fighter will refill very quickly. Note: A full health meter is no guarantee of winning a match; a knockdown move against your character can still end the match quickly and your character can be attacked during the energy refill.
View gained skill
Press C-Left, C-Right, C-Up, or C-Down before selecting a character.
