X Racing
Hidden Stages
Enter the password SFO.

 X-Com
type the name of one of your bases as JUSTLIKEME remember no spaces and your soilders will become stronger and have a TU of 255 units

Manufacture for Free
Go to Start a New Manufacturing Job from the list of items. When the window pops up asking you how many units you want and how many engineers, leave both values at 0. Just click OK, then quit from the list of items to the main menufacturing screen. You selection will be listed as normal with 0 units, 0 engineers. Now go to change the values of the manufacturing job and change the number of units to just 1. This 1 unit will then be manufactured in the same time as normal but for free, plus it won't use any materials.


 X-Com Terror from the Deep
Money and Cheaper Items
Enter AEIOU for the base name.
Buffed Soldiers
Enter JUSTLIKEMIKE for the base name.

 X-Men Vs. Street Fighter
Fight as Akuma (Gouki):
While at the character selection screen highlight Magneto, Juggernaut, Dhalsim, or Vega and press Up.
Fight as Apocalypse:
Select versus mode. Highlight Gouki, hold Select for at least five seconds and press any Punch button.
Fight as Street Fighter Alpha 2 version of Chun Li:
Highlight Chun Li on the character selection screen. Hold Select for at least five seconds and press any button.
Random Character Selection:
Highlight the bottom left of the character selection screen and press Left. Alternatively, highlight the right end of the character selection screen and press Right.
Continue Attacking:
To continue hitting the defeated character immediately press Start after winning a match.
In-game Reset:
To reset the game hold R1 + L1 + Select + Start.
Tag Team in Vs. Mode (Japanese)
Go to the mode selection screen (where you choose Arcade Mode, Vs. etc.) and QUICKLY press Square, Square, Right, X, L1. If done correctly, the option screen will appear.
American EX Options Menu
At the Main Menu, quickly press: Triangle, Triangle, Right, Circle, L1. You can then choose between original and EX modes, plus you can set the game to always give you a full super bar.
Easy Way to Beat Apocolpyse
The best person to beat Apocolpyse is to Storm and Magneto, Chun-Li and Cyclops. Whenever you begin to fight with Chun-Li and Cyclops super jump and lighting kick his hand then when your power gets up to three preform the team super move. Do the same thing with Storm but do the Double Typhoon until it gets to level three then the team super move.
Gambit's Monstrous Combo
First have your super bar at level 3, and of course be playing as Gambit. Then, do Gambit's Royal Flush super. If it connects, cancel it after at least the 33rd hit while the super is still going on with a second Royal Flush. Then, when the combo counter reads at least 62, cancel the second Royal Flush while it is still going on with a third Royal Flush. You will have 99+ hits! (Although the combo counter stops at 99.) Note that this will work only if the opponent is standing on the ground. If he/she is slightly in the air, the cards Gambit throws will not hit the opponent as much times.
Taunt Your Opponent
After winning a round, press Start and you'll be able to kick or taunt your defeated opponent.


 X-Men: Children of the Atom
Play as Akuma, Player 1
At the Character Select screen, place the cursor on Spiral, then hold it there for three seconds. Then put your cursor on these characters in the following order: Silver Samurai, Psylocke, Colossus, Iceman, Colossus, Cyclops, Wolverine, Omega Red, and Silver Samurai. When you stop on Silver Samurai, wait for three seconds, then press Light Kick, Hard Kick and Hard Punch simultaneously. If this is done right, the announcer will say "Silver Samurai", but Akuma will drop down and take his place as your character.
Play as Akuma, Player 2
At the Character Select screen, put your cursor on Storm, then hold it there for three seconds. Then, put your cursor on these characters in the following order: Cyclops, Colossus, Iceman, Sentinel, Omega Red, Wolverine, Psylocke, Silver Samurai, and Spiral. (The button movements for this sequence are in the following order: Right, Down, Left, Left, Left, Down, Right, Right) When you stop on Spiral, press Light Kick, Hard Kick and Hard Punch simultaneously. If this is done correctly, the announcer will say "Spiral", but Akuma will drop down to take his place as your character.
Quick Continue
At the Continue screen, press L1, L2, R1, R2, Start.

 X2
Various Cheats
Enter any of the following "Passwords" at the password screen:
Password
Effect
220969
9 Lives
267776
9 Continues
180771
Transparent Jets
300167
See Ending
Level Passwords
Level
Password
02
713948
03
900277
04
213490
05
866141
06
321904
07
196861
08
040186
09
841003
10
216409


 Xena: Warrior Princess
Level Select
At the Main Menu, highlight New Game and press Triangle, Square, Circle, Triangle, Square, Up, Up, Up. If done correctly, you will hear a sound.
Full Shield and Attack
At the Main Menu, highlight New Game and press Triangle, Square, Triangle, Square, Square, Up, Up, Up. If done correctly, you will hear a sound.
Invincibility
At the Main Menu, highlight New Game and press Up, Up, Up, Circle, Square, Up, Right, Left. If done correctly, you will hear a sound.

 Xenogears
Get Alices Dress
when you are fighting dan at the tournamet do not kill him just worry about keep fei alive during the fight.
After a while dan will start talking again and give you the dress.

 Xevious 3D/G+
Debug Mode
Play the original Xevious, and at the title screen, press Square + X + Start.
Black Ship
First, highlight the Reset Option at the Title screen. Next, hold L1 + L2 + R1 + R2 + Start. The Game Start option should now be highlighted, press Start. Keep holding the buttons until your ship changes.
Fat Ship
First, you have to get the Black Ship. Next, go back to the Title screen and highlight Exit in the Configuration Mode. Now start the game again by entering the Black Ship code above.
Five Continues plus more
Highlight Xevious 3D and hold L1 + L2 + R1 + R2, then press Circle. During the loading screen, continue to hold the buttons and quickly press Circle.
Hidden Ships
Highlight Start Game at the Title screen and hold Left + Square + X + Start to play with the Heihachi ship. Or, hold Right + Square + X + Start to play with the Paul Ship. Keep holding the buttons until your ship changes.

 X-Games Pro Boarder
Passwords
Square,Triangle,X,Square,Circle,Circle = all courses & circuit
triangle,X,square,X,triangle,circle = bonus boarder: Ollie B
enter the following cheats on the password sreen
Full Metal Jacket = square,circle,X,triangle,triangle,X,circle,square
Invincibility           = square,triangle,circle,X,X,circle,triangle,square
Enable port 2       = X,triangle,square,circle,triangle,circle,X,square
(During play, press triangle on pad 2 to destroy the enemy base, or press square to destroy your own base.)
LEVEL PASSWORDS
Level 2 = square,triangle,X,circle,triangle,square,circle,X
Level 3 = square,X,circle,triangle,triangle,square,X,circle
Level 4 = Square,triangle,X,circle,circle,triangle,X,circle
Level 5 = X,circle,square,X,triangle,square,X,circle
Level 6 = square,circle,triangle,X,circle,X,square,circle
Level 7 = X,circle,sqyare,X,triangle,triangle,X,circle
Level 8 = X,X,circle,triangle,X,circle,square,X
Level 9 = circle,Xcircle,square,X,circle,square,circle
Level 10 = circle,triangle,circle,circle,square,triangle,X,circle
Level 11 = X,square,circle,X,X,square,square,circle
Level 12 = X,X,circle,X,circle,square,circle
Level 13 = circle,triangle,X,circle,triangle,square,X,circle
Level 14 = square,triangle,X,circle,triangle,X,circle,square
Level 15 = square,triangle,X,circle,square,triangle,X,circle
Level 16 = circle,X,circle,square,square,X,square,X
Level 17 = circle,square,triangle,X,triangle,X,circle,square
Level 18 = square,circle,square,X,X,circle,circle,triangle
Level 19 = X,circle,X,circle,triangle,triangle,X,circle
Level 20 = triangle,triangle,X,circle,triangle,triangle,X,circle
 XI
Gallery
Complete the following goals to unlock the corresponding Gallery:

Gallery 1 to 10:Complete puzzle mode levels 1 through 10.
Gallery 11:Select trial mode, then get into the score ranking in endless mode.
Gallery 12:Select trial mode, then get into the level ranking in endless mode.
Gallery 13:Select trial mode, then get into the score ranking in time limited mode.
Gallery 14:Select trial mode, then get into the max chain number ranking in time limited mode.
Gallery 15:Select trial mode, then get into the max chain score ran conqueror's continent in time limited mode.