An easy survival mode:

After unlocking the Extra Options, go to Option Mode at the main menu. Go to Extra Options, select Player One Life Gauge Type and change it to No Damage. Then, go to Groove Gauge Type and change it to Infinite. After this, start survival mode and defeat all 46 characters without taking damage and your Groove Bar will always be full.

The Middle Boss conditions:

The middle Boss appears when the following conditions are all fulfilled:

Unlock Victory quotes:

Press and hold [b]Start[/b] + [b]FP[/b] after winning a stage to make your character say an opponent specific quote. Press and hold [b]Start[/b] + [b]FK[/b] to make the character talk with a team member.

Unlock Custom Grooves:

The Custom Groove option appears once a normal Boss has been defeated (normal Gouki or Rugal). Normal Bosses appear by fulfilling two of the four following conditions.

1000 GPS

Get over 1000 GPS by the end of the game. Get four or more special KOs. Middle Boss has appeared. Get two or more LV3 super combo KOs.

1500 GPS

Get over 1500 GPS by the end of the game. Beat the Middle Boss (Geese or Bison/Vega). Get at least one Finest KO.

Unlock Hidden Bosses:

Hidden Bosses can be playable once they have been beated. The conditions of the Bosses to appear are to fulfill two out of the following three conditions. If you play with a Capcom groove you will get God Rugal, and if you play with a SNK groove you will get Shin Gouki.

Infinite custom groove:

Beat all characters straight in survival mode. The custom groove option settings will become infinite.

Extra color edit mode options:

Push [b]Start[/b] while editing the colors for your character to display more options on the left side of the screen.

Extra options:

Win the  Boss challenge mode with no continues. The Extra Option becomes available in the game.

Random Groove:

At the groove selection screen push Start.

Unlock Boss challenge mode:

To unlock the boss challenge mode you must beat hidden Bosses (God Rugal, Shin Gouki) and unlocked. Once this has been done press and hold [b]Triangle[/b] + [b]Square[/b] when choosing arcade mode.

One on three tag team mode:

Highlighter any fighter at the character selection screen and press a button. Allow time to run out and the game will start in one on three tag team mode. Note: Do not select one on one battle mode.