Select Gambit, Iron Man, and War Machine, then get a level 3 hyper combo gauge and do all their hyper combos (L + R). It should do a 114-hit combo. If not, try starting the Hyper Combo with another person.
Abyss' first stage
Defeat Abyss with any time limit in arcade and score attack modes. His first stage will be unlocked in training and versus modes.
Change clock in background
To change the time of the clock in the background of the clock level, simply change the PlayStation2's system time.
Change team order
The order of your fighters will appear before a versus match, with "1", "2", or "3". You can select the first and second fighters of your team, and thus change the entire team order. To select the first fighter, press LP + LK for the character marked "1", MP + MK for the character marked ''2'', or HP + HK for the character marked ''3''. Then, press the same button combos to select the second fighter. Press Start to continue.
Cheaper hidden fighters
Exit and enter the shop screen until the price of the hidden fighters are lower.
Continue attacking
Press Start immediately after winning the match to move almost everywhere and have the ability to continue hitting the defeated character.
Defeating Abyss
Select Cable. For Abyss' first form, just block his attacks and then press Y to shoot. Repeat this until he dies. For his second form, distance yourself far as possible and shoot. Repeat until he dies. For his third form, just use Cables Hyper Viper. It takes off 90-95% of his life in one blast and will be a 115-130 hit combo. Then, just hit him once or twice with any attack to defeat him. To defeat Abyss in his second form, choose Cable. Keep shooting Abyss with the pistol and keep shooting till you have level 1 on the gauge. Execute Cable's Hyper Viper Combo. This should kill him -- if not keep repeating this pattern. The works if you are fast enough to kill him while he performs his short range attacks. Choose Megaman, Cable, and Cyclops. Play under the easy or medium difficulty setting. At Abyss, use Megaman then jump behind him and shoot. During his second form, use Megaman and continue shooting at him. You should have a level three power bar by now. At Abyss' third form, wait. He always dives down before attacking. When he reappears, do a Triple Hyper combo. If the game is set on very easy and high damage, Abyss should die in one hit.
Hayato: Combos
Thirteen-Hit Plasma -Sword Combo: Get your hyper gauge to level one. Jump in deep, press LP, while still in the air press LK,LP, LK, HP, Down, Down/Right, HP, Down, Down/Right [LP, HP] for seven hits.
Hayato: Profile
Hayato's plasma combo variations make him a strong combo player, but most special moves lack quick recovery time and leave him wide open for an opponent to counter. Hayato's sword gives him decent reach, but only an above -average to expert player should select him up for assist type --,use his expansion type.
Multiple character selection
Unlock every costume and character to chose multiple people. For example, player one could chose three Charlie's and the other player could also chose three Charlie's.
San San: One hit kill on Spider-Man
Use San San's Eating special and have the damage on high. Spider-Man can be defeated with one special.
Switch characters during match
Use the following to switch between characters in the middle of the game. For example if you choose Cable, Ryu, then Ken, but later in the second stage you want Ryu to appear first -- Hold L for the second character and R for the third character at the versus screen.
Tyrant: Blow him up
Send out the Tyrant. After he is done with his combo and starts yelling, press the combo for her rocket launcher and he will explode.
Unlimited chain supers
Note: This trick only works in training mode. Set the combo gauge to infinity in the training menu. Then, start a super and start another one. This can be done an unlimited amount of times. This works best with characters who have beam supers.