How To Play Smoke in Mortal Kombat 3 on SNES
To play as Smoke, perform the following button presses at these first 3 screens.
At screen 1 Simultaneously press and hold Left and A.
At screen 2 Simultaneously press and hold Right and B.
At screen 3 when it says "THERE IS NO KNOWLEDGE THAT IS NOT POWER" Simultaneously press and hold Button X and Button Y until Smoke walks onto the MK3 symbol. Now you can play as smoke.