Stage select and ring size -
At the start screen, press UP(12x's), and press ENTER. Go to the options menu, 
and you should here "K.O.!". Move the cursor to the exit, and press down once 
more to make the cursor disappear. Press DEL and a second options menu will 
appear. 

Play as gold dural -
In the character selection menu, press DOWN, UP, RIGHT, then DEL+ LEFT. You 
should here a confirming sound.

Play as silver dural -
In the character select menu, press DOWN, UP, RIGHT, then DEL + LEFT. 

Choose victory phrase -
Hold either DEL, END or PGDN, and you can choose.

Add dural to the records screen -
At the start screen, press UP(17x's), then press ENTER. Go to the options 
screen, and you should hear "RING OUT!". 

Slow motion replaying -
At the end of the round, hold DEL+END+PGDN before the character does their 
victory stand.