When either first turning on the game or resetting it, quickly tap B,A,X,Y over and over as the Jaleco logo in the beginning appears and keep tapping until it disappears. You've gotta tap fast & don't feel stupid, because it takes a few tries. If done right, the screen should be dots and spaces. Hit start and the screen should shift a bit. Then, hit down three times and press START to enter the options. Angry mode should now be called "Ikari Mode." Set things up the way you like and then exit. Now you should see the Japanese title screen that says Rushing Beat Ashura (the real name for Brawl Brothers). Play it and notice the subtle differences in the two versions (the sewers scene is VERY different).

Japanese Demo

    After getting the Japanese screen, let it sit there for awhile and you'll see some demo stuff including the characters' full names. BEWARE: if you let the demo run it's full course, it'll revert back to regular Brawl Brothers mode and you'll have to do all that tappin' again.