Fatal Fury 3

Small fighters:
Select versus mode and choose two fighters. Hold B + C on controllers one and two during the "Now Loading" screen prior to the start of the match.

Speedup mode:
Hold Start and choose a fighter at the character selection screen.
Information in this section was contributed by Bill Smallwood.

Expert mode:
Press Back, Forward, Back, Forward, then Forward, Back, Forward, Back at the "How to Play" screen.
Information in this section was contributed by Bill Smallwood.

Hint: Super Super Death move:
To perform the Super Super Death Move (Cho Cho Hissatsuwaza), hold A + B + C + D and repeatedly tap Start at the start of the fight but before "Go" appears. Your character's name will turn green to confirm correct code entry.
Information in this section was contributed by Bill Smallwood.