Use these commands to start the game.

MK3 603015      Slow motion
MK3 8000        Turbo mode
MK3 12345       Tall characters
MK3 54321       Miniature characters
MK3 1111        Miniature characters that float
MK3 8888        Jumbo characters
MK3 1995        Invisible Kombat
MK3 831         Characters turn invisible
MK3 9966        Mirror mode
MK3 0666        Smoke enabled
MK3 1000000     Shao and Monty enabled (only in 2 player mode)