CheatCodes.com has all the official Tekken 2 PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 25, 2013 for Tekken 2 are shown below.
At the main menu press Square, Triangle, Circle.
After unlocking all twenty three characters, which includes the hidden characters, save the game. Then, unplug controller two, if one is present. Put the memory card with the Tekken 2 saved game file in the slot one. Now when the text "Namco Presents" appears, hold Up/Right + Select + Circle + X. If you entered the code correctly, a screen titled "Theatre Tekken 2" with a list of game graphic files will appear.
When selecting your character, hold L1 + L2. Hold these buttons until the fight begins. Now your character will appear as a green wire frame and the perspective will be from behind your character (looking through them).
Beat the game with only one continue to get Kazuya, beat the game with no continues to get devil. (Beat the game as in, succesfully going thru 10 rounds without a continue.)
To play as Wang beat the game with Law.
This one is simple. Instead of trying big moves like Yoshimitsus Sword Poke, (which the opponet will usually block anyway) concentrate on the smaller moves like Shin Kick. If you do them rapidly, it will cause your opponet to not have enough time to react.
Start an Arcade Mode game. When you get to the third match, wait until your match winning round. Then, let your opponent beat you down to 5% energy. Once you have done this, quicky KO your opponent. If done correctly, you should hear the announcer say "GREAT!". Now your forth match will be against Roger or Alex. After the match, Roger and Alex will become selectable characters.
To play as Kazuya, beat the Devil with any sub-boss.
Beat the Devil with Kazuya. Press Kick to select Devil.
Beat the Devil with Kazuya. Press Punch to select Angel.
To play as any sub-boss, beat the Devil with each character.
Completely finish the game by capturing all the characters. Then when selecting your character, hold Select + Up. Hold these buttons until the fight begins. If you entered the code correctly, you will hear the sound of a punch. Use an uppercut or sweep move to send your opponent to skyward.
When selecting your character, hold Select. Hold this button until the fight begins. Now your character will have a big. For a larger head, win a match in big head mode and then hold down Select during your victory pose. Continue to hold Select throughout the character selection preocess until the next match begins. Note: You must have beaten all of the sub-bosses to use this code.
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