Mortal Kombat II (Game Gear)
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Fight Jade
Defeat the person before the ? (box) without using the punch button or block. You also have to beat him/her without losing any life.
Fight Smoke
When ''Toasty'' appears in the bottom-right, press Punch+Up. You shall now be able to fight Smoke.
Random Charachter
Highlight Liu Kang and press up + start. A random fighter will be selected for you to use.