At the player selection screen, hold A + B and press Start to trigger the Level Select cheat. Once in that screen, set to stage 5 and hold Up + A + B on controllers 1 and 2, and then press Start on controller 1. If done right, you'll access a hidden minigame based on the "Sasuke vs. Commander ", Arcade game released by SNK.
Level and Difficulty Select
At the Player Mode Menu screen, hold A & B and press Start.