To unlock Xtal, complete the game on Normal difficulty without continuing.

To unlock Zulu, complete the game with all of the standard characters.

To play the Neco mini-game, give all the button functions null values. (In Key Configuration screen, assign all buttons to "No Use".) Then select "Test 2" option to play mini-game.

To unlock 16 new colors for a particular fighter, complete the game with him/her. Then, at the character selection screen, highlight the fighter, hold Select and push one of the attack buttons.

To unlock the "Congratulations!" title screen, log 200 hours of playing time.

To unlock Neco, complete the game with Xtal and Zulu.

To activate stage select, pit Zulu against Xtal in "2P VS" mode. Have each fighter win with an elapsed time of 5 seconds or less. Thereafter, you will be able to choose the stage in VS mode.

Cygnus - 04
Draco - 05
Eos - 06
IO - 03
Neco - 09
Nereid - 01
Tau - 00
Wild 3 - 07
Xtal - 09
Zero - 02
Zulu - 08

To unlock time attack, complete the game at Normal difficulty (or higher).