On the title screen press [E]+[N] to turn off the barriers.
Energy: On the fighter selection screen, move the mouse to the "S" in "SPORT" and press all three mouse buttons, then move the mouse over the "T" and do the same thing.
Now you may boost your energy by pressing the [?] and the [#] key on the keypad together.
This only works on player one.
Other cheats: On the high-score table, enter the following names:
3*3 EYES.. - for Lee-Pai
OVERFIEND. - for Chochin
F.O.T.N.S. - for Tumpo
SSSSMFSFBF - for Ninja
ASTRO BALL - for Tam