Start a Two Player match, and have Player One win three matches in a row. Now, back at the Character Selection screen, highlight the Executioner and hold Start and Evade. Hold these buttons down until Grendel appears, than hit an attack button to select him.
7/15/2000
Level Select
At the Character Select screen, and on the fighter whose stage you want, push Start four times, and then select who you would like to fight as.
7/15/2000
New Character Colors
At the Character Select screen, and on the fighter you desire, press and hold any of the four C Buttons. Now press Evade, and then hit A and B to begin the match with a new character color.
7/15/2000
New Arena
Tap the Start Button on each of the names listed in the right order: Mordus Kull, Taria, Ragnar.
7/15/2000
Big Head Mode
Tap the Start Button on each of the names listed in the right order: Ragnar, Al' Rashid, Takeshi
7/15/2000
Tiny Fighters
Tap the Start Button on each of the names listed in the right order: Takeshi, Al' Rashid, Ragnar, Xiao Long
7/15/2000
Random Artifical Intelligence
Tap the Start Button on each of the names listed in the right order: Hell Knight, Xiao Long, Dregan, Namira
12/31/2000
Two Player Practice Mode
Highlight Practice and press Start on both controllers at the same time.
3/4/2001
Fluffy Bunny Slippers
At the character entry screen, move the cursor over the following fighters pressing START on each one: RAGNAR, DREGAN, KOYASHA. The pick your fighter and he will be wearing bunny slippers!
8/21/2001
Head Switch
To switch your head with your opponent's heads,press Start on Al-Rashid,Takeshi,Mordos Kull,Xaio Long and Namira,in that order.
8/21/2001
Fight on Mini-Golf Course
To fight on a mini-golf course,press Start on Koyasha,Mordos Kull,Takeshi,in that order.Pick your character and play Mini-golf,Mace style!
8/21/2001
Play as Ned
To play as Ned the Janitor,press start on Koyasha,Executioner,Lord Deimos,in that order,then select Xaio Long,and you will be Ned.He as all the same moves as Xaio,just look different.
7/9/2002
Play as Gar Gunderson (War Mech) or Ichiro
At the first screen to appear when the Nintendo 64 is powered on, press Right, Up, Left, Down, Right, Up, Left, Down. If you entered the code correctly, you will hear a sound. Now Ichiro and Gar Gunderson will appear above the Executioner on the select a character screen.
7/9/2002
Play as Pojo!
Perform Taria's execution in one or two player mode. Then, start another match, highlight Taria, and hold Start on the character selection screen. Now Pojo! will appear as a selectable character. Continue holding Start and press Quick to select Pojo! as your character.
7/9/2002
Screen Centering
Hold L + R + Z and move the Analog-Stick and D-pad in the same direction.
7/9/2002
Alternate Constumes
On the character selection screen, highlight a character and press L, R, C-Up, C-Down, C-Left, or C-Right to select from five additional colors.
2/27/2003
Unlimited Credits
When you get defeated by a computer opponent, press the start button on the other controller. You will be able to fight the computer again.
1/3/2006
Fight at Machu Pichu
At the character select screen, highlight Namira and press start, highlight Koyasha and press start, and then highlight Taria and press start.