Press START at the groove select menu.

Hold TRIANGLE + SQUARE when confirming arcade mode. Both Shin Gouki and God Rugal must also be unlocked for this code to work.

The mid-boss appears to fight you all the following have occured:

• No match has ended with a time out
• Computer has made less than 6 first attacks
• Computer has made less than 3 special KOs

Confirm your first fighter on the character select screen and let the time run out before confirming your remaining two choices.

Defeat all opponents straight in survival mode.

Clear boss challenge mode without continuing.

Hidden bosses can be played when they have been beaten. To make them show up, you need to do any two of the following in a tournament:

• Accrue at least 1500 GPS at the game
• Beat the mid-boss (Geese or Bison/Vega)
• Perform at least one Finest KO

Capcom groove unlocks God Rugal, while SNK groove unlocks Shin Gouki.

Hold START + FIERCE PUNCH after winning a fight (not a round) to give a parting taunt to the opponent ...

... Or hold START + FIERCE KICK to offer thanks to a fellow teammate instead.

Custom groove is unlocked when the "hidden boss" is beaten.