Mortal Kombat 2

Random character:
Press Up + Start at the fighter selection screen without moving the selection box from its original position.

Disable throws in versus mode game:
Hold Down + HP on player one and two's controls after both fighters have been selected. A message will confirm correct code entry.

Display top fifteen players:
Press Down during attract mode.

Fight against Jade:
Progress through the game until the match the precedes the "?" match. Defeat your opponent using just low kicks. Jade will now be your opponent during the "?" match.

Fight against Noob Saibot:
Win 50 consecutive matches.

Fight against Smoke:
Press Down + Start when Dan says "Toasty" on the Bridge stage.

Pong:
Accumulate 250 battles at the versus screen. Both players can play the Pong mini-game.