All of the bosses, along with the alternate versions of fighters where they are possessed by Gulab Jamun, can be playable in Versus mode. To play as each one, a special name needs to be entered for each character in the "NAMES" entry box in the main menu along with a specific birthday. This will unlock the characters, but none of them will be visible on the character select screen. To actually play as the character, you must move the cursor to a spot due east of Crimson Glory to access an invisible character select screen, and the special character will appear above (continue pressing right to scroll through the rest of the characters). It is possible to enter more than one secret code and play matches between two special characters. The names and birthdays in question are:

• Kull - "A GAVIN" 6/11/70 (in reference to Naughty Dog co-founder Andy Gavin and his birthday)
• High Abbot - "J RUBIN" 1/6/70 (in reference to Naughty Dog co-founder Jason Rubin and his birthday)
• Black Dragon - "WYVERN" 3/9/27
• Major Trouble - "BAD BOY" 2/4/8
• Voodoo - "EVIL" 6/6/66
• Gulab Jamun - "GULAB" 2/29/00