? Menus  -  During the story screen, press the following buttons very quickly: HK, LK, RN, LP, HP, HP, HP, LP, LP. If it is done right you'll hear "OH-MAW" and you'll get BOTH the Red and Blue ?'s.

These question marks will open up some hidden extra options which are outlined below.

Red Question Mark

Freeplay - ON/OFF 
Fatality Time - ON/OFF 
Collision Boxes - ON/OFF 
One Round Matches - ON/OFF 
BLUE QUESTION MARK 

Level Select - ON/OFF 
Throwing - ENABLED/DISABLED 
Unlimited Run - ENABLED/DISABLED 
Bloody Kombat - ON/OFF 
Smoke - ON/OFF 
Khameleon - ON/OFF 

Beat Motaro Easily  -  The easiest way to beat Motaro is by waiting until he gets close enough to hit with a straight up jump kick. If you connect, you will be able to hit him with a combo. Keep doing this until he dies.

Sometimes you have to stay a full screen away from him so that he doesn't hit you with any fire balls. If he tries to teleport, he will usually walk into the jump kick which would lead to a combo. 

Bonus Games  -  Space Invaders: On the pit stage, if a silhouette goes over the moon, press the Z button when it is over the moon.

Pong: play 50 two-player matches in a row.

Galaga: Play 100 two-player matches in a row. 

Exploding Babalities  -  To do this, you must press high punch, low punch, high kick, low kick, after you enter your character's babality command, and before he/she turns into the baby. 

Fight Khameleon  -  If you hear the word "Toasy" on the Star Bridge stage, quickly press Down + Start to fight Khamelion. 

Half Power  -  In two player mode, when the VS screen appears, press C up three times, then C right three times. The code at the bottom of your half of the screen should read dragon 33 (the rest after the second 3 should be dragons). This works for player two also but not for both at the same time. 

Harder Game  -  For a greater challenge in one-player mode, highlight Kano, then press Down + Start. You will hear Shao Kahn say, "You'll never win." When you start a new tournament, there will be plenty of Endurance matches to go around. The Champion ladder has: fight Khameleon, then Motaro, then A LOT of Endurance matches, then Shao Kahn. Some of the Endurance matches have at least *SIX* guys to fight in the same match! 

Kombat Codes  -  when the story screen comes up, rotate your control pad in a clockwise direction. After a few rotations the Kombat Kode screen should appear. Kombat Kodes are entered using a button to control each of the six boxes. (P1 and P2 refer to player 1 and player 2.) 

Box1 Box2 Box3 Box4 Box5 Box6 
P1 Low Punch P1 Block P1 Low Kick P2 Low Punch P2 Block P2 Low Kick 

The Stages

STREETS:079-035 
BRIDGE:077-022 
SHAO KHAN'S CAVE:004-700 
ERMAC'S PORTAL:933-933 
NOOB SAIBOT'S DORFEN:050-050 
SUBWAY:880-088 
SCORPION'S LAIR:666-444 
PIT 3:820-028 
ROOF TOP:343-343 
SOUL CHAMBER:123-901 
TEMPLE:600-040 
THE WATERFRONT:002-003 
THE GRAVE YARD:666-333 
JADE'S DESERT:330-033 
BELL TOWER::091-190 
SHAO KHAN'S TOWER:880-220 
DEAD POLL:222-222 
ARMORY:191-191 
THE PIT:919-919 
STAR BRIGDE:606-606 
THE TOWER:101-101 
THE PORTAL:007-007 
PIT 2:166-661 
COURT YARD:121-121 
WASTELAND:212-212 
THE LAIR:000-666 
HANDICAPS 

P1 1/2 ENERGY:033-000 
P2 1/2 ENERGY:000-033 
P1 1/4 ENERGY:707-000 
P2 1/4 ENERGY:000-707 
SUPER ENDURANCE:024-689 
P1 DOES 1/2 DAMAGE:390-000 
P2 DOES 1/2 DAMAGE:000-390 
NO SPECIAL MOVES:555-556 
COMBOS DISABLED:722-722 
UNIKORN REF SANS POWER:044-440 
THROWING DISABLED:100-100 
BLOCKING DISABLED:020-020 
DIFFERENT KOMBATS 

REAL KOMBAT:040-404 
PSYCHO KOMBAT:985-125 
RANDPER KOMBAT:444-444 OR 460-460 
DARK KOMBAT:688-422 
SILENT KOMBAT:300-300 
BLOODY KOMBAT:109-901 
The winner of the first round fights... 

CLASSIC SMOKE:205-205 
NOOB SAIBOT:769-342 
MOTARO:969-141 
SHAO KHAN:033-564 
KHAMELEON:123-321 
Secret Messages 

Rain can be found in the grave yard:717-313. There is no knowledge that is not power!:123-926. Hold flippers during casino run:987-666 
No fear, max countdown,E B Button, Skydive:282-282 
Whacha gun do? E.B.:004-400 
Skunky!!:122-221 
Don't jump at me:448-844 
Play the wavenet ultimate MK 3:550-550 
Babalities are reversible!:202-808 

Other Effects 
Automatic Kombox:484-484 
Invisible energy bars:987-123 
Show the revision #:999-999 
Unlimited run:466-466 
Hyper run jumps:321-789 
Play galaga:642-468 
Throwing encouraged:01-010 
Uppercut recovery:788-322 
Play pong:246-246 

The following codes only work in "2 ON 2" and "3 ON 3" games 

Explosive Kombat and Blocking disabled:022-220 
Explosive Kombat:227-227 

Level Select  -  Highlight Sonya and press Up + Start. 

Play as Human Smoke  -  To play as Human Smoke, press and hold Away, High Punch, High Kick, L, R before the screen says "Fight". 

Play as Khameleon  -  At the story line, press Right-C, Up-C, A, B, Down-C, Up-C, Right-C. 

Play as Motaro  -  This trick only works on the Desert and Wastelands. Choose anyone, but before the match starts press and hold Away + Low Kick + High Kick. When the match starts you will morph into Motaro. 

Play as Shao Kahn  -  Select the Rooftop stage, Pit 3, or Kahn's Kave. Before the match starts, hold Down + High Punch + Low Punch. 

Random Character Select  -  To select a fighter at random, highlight Saibot and press Up + Start. 

Unlimited Credits  -  For unlimited credits, press Down, Down, Up, Up, Right, Right, Left, Left at the attract mode screen.