SNK vs. Capcom: Match Of The Millennium

When selecting a song, press Option (instead of A button).
Instead of the normal symbols scrolling on the screen (A, B, Arrows), it will instead be Fishes, Honey Jars (or something like it), and Mice (respectively). Also, Felicia will be in her other costume.

On the Character Select Screen, Press and hold A on the character you select to get a new costume color.

To access blood in the game, simply change the language to Japanese in the internal settings of the NGPC.

Change the default language to "Japanese" in the system settings before using the game.

Halfway through the game you must play a one-on-one battle with your lead character's "rival". You only get one chance, and if you fail, you will not unlock anything. Assuming you beat this character you will continue fighting opponents until you face the last Boss, either "Wild Iori" or "Evil Ryu" (depending on which character(s) you played as). After defeating this character, you are presented with a square consisting of nine smaller squares (resembling the side of a Rubik's Cube). A number of these from 1 to 6 will disappear depending on the difficulty level you have chosen. These squares vanish randomly, and only when all nine are uncovered will the hidden character be revealed. This is tricky because the squares disappear in a random order, and sometimes only squares you have already broken will vanish. Theoretically you can unlock them in three tries, but it normally takes six to nine times for each hidden character, assuming you unlock only one new square each time. These odds are helped by choosing disparate characters. For example, defeat the game fifteen times using Ryu, Ken and Morrigan (similar type characters) without unlocking Akuma, the first hidden character. Then, after using Zangief, a completely different character, Akuma became unlocked. The other characters that can be unlocked are Yuri, Akari, B.B. Hood, Geese, M. Bison, Orochi Iori, and Evil Ryu.

Successfully complete game on Gamer difficulty.

Select Olympic mode, then select SNK mode. Choose Target 9 and hold Option when the small flying "droids" appear.

Select tag or team mode. Select any fighter and press Option at the character selection screen. The CPU will advance past the second and third characters on your team and set your fighter against two or three opponents.

There are eight hidden characters. In order to play as them, you must beat the game and at the end, a picture of one of the characters is shown covered with blocks. It will randomly remove a few blocks, the higher the difficulty the more blocks. When all are uncovered you get that character.
NOTE-this is completly random.
The characters are Yuri, Akuma, Akari, B.B. Hood, Geese, M.Bison, Orochi Iori, and Evil Ryu.

IF you do Dan's special move (Down/Left, Left, A), it will copy some character's provokes (first Chun Li, Mai, Sakura, Kyo, Akuma, some jumps, then Yuri sticking her thumb out).