Alternate costumes
Press B at the character selection screen.
Beat Final Valgas in a Snap!
Here is an easier way to beat the Final Valgas. Just simply go under his armpit (as bad as that sounds...) and keep making small attacks. You should be able to kill him before he does you.
Bonus items
Successfully complete the game using four characters to unlock a shield, heavy chain gun, ray gun, and extending pole.
Change victory view
Press the D-pad or Analog-stick to change the viewing angle at the end of a match. Press A to move the camera in.
Dual Virtua battle mode
Successfully complete the game as Valgas to unlock this mode on page 6 in the Power Stone Collection. This mode allows a versus mode game to be played with the Virtua battle mode camera angle on each part of the split screen.
Extra Options
Successfully complete arcade mode as any character under any difficulty setting. An "Extra Options" selection will be available.
Fight as Gold War Machine
Highlight Zangief at the character selection screen. Then, press Left(2), Down(2), Right(2), Down(2), Left(2), Up(4), Right(2), Left(2), Down(4), Right(2), Up(2), Left(2), Down(2), Right(2), Up(5). Then, Gold War Machine will appear above Zangief.
Fight as Orange Hulk
Highlight Chun-Li at the character selection screen. Then, press Right(2), Down(2), Left(2), Right(2), Down(2), Left(2), Up(4), Down(2), Right(2), Up(2), Down(4), Left, Up. Orange Hulk will appear above Ryu.
No damage
Enable "Extra Options" code. Enter the extra options screen and set "Transformation Damage" to "0%". Start another match, collect three gems, and transform. Do not use any regular attacks on your opponent after transforming. Instead, throw objects to keep from getting damage.
Play as Boss characters
Successfully complete the game with all of the characters to unlock Kraken. Successfully complete the game as Kraken to unlock Valgas. Note: To play as Final Valgas, successfully complete the game as Valgas without using continues under any difficulty setting. Enter the page 12 of the Power Stone Collection to see Final Valgas. Note: Final Valgas may only be selected in versus mode, by only one player per match.
Play as the final form Valgas
Beat the game with no continues using Valgas and he will appear in your power stone collections page 12 (you can only use him in versus mode)
Scrap book
Accumulate $1000 or more in the VMS mini-games to unlock a scrap book option on page 13 of the Power Stone Collection.
Sound test
Accumulate $2000 or more in the VMS mini-games to unlock a sound test option on page 25 of the Power Stone Collection.
Super Invincibility
After unlocking all the "Extra Options" highlight "Guage Timer" and put it on Off. Then highlight "Transformation Damage" and put this on 0%. Then highlight "Transformation Attack" and put this on 200%. Now enter a fight and collect all the "Power Stones" you should now be Invincibile and have Super Strength. NOTE: This also works in Power Stone2.
Virtua battle mode
Unlock Valgas as a playable character. Virtua battle mode will be available on page 5 in the Power Stone Collection. This mode allows the camera to stay behind your character during a match.