Hint: Two player versus without bad ending:
Win a two player versus fight in the last Boss' room. Answer "Yes" on the second question. You will fall down a trap to Round 6. Go through the levels until you reach the last Boss again. This time he will not ask any more questions, and will start fighting. Defeat him and the good ending will appear during the credits.
Hint: Fighting Abadede:
Punch Abadede, the Round 3 Boss, before he hits you when he dashes towards you. He will dash again, so punch him again. Repeat this until he falls down and look out for any other opponents. Note: Abadede makes an appearance in Streets Of Rage 2 as the Stage 4 main Boss in the underground arena.
Hint: Fighting Big Ben:
Make sure you are out of Big Ben's way when he breathes fire (e.g. if he is near the top of the screen, make sure you are at the bottom so he will miss.) Then, get behind and grab him. If you throw him now, he will collapse on you, so quickly release him. Then, grab him immediately and he should be facing you. All you have to do now is continually hit him until he is defeated. Note: Big Ben makes an appearance in Streets Of Rage 2 on Stage 4 near the baseball diamond. He is a bit shorter and wears a cap.
Hint: Fighting the final Boss:
Play a two player game. When you reach the final Boss, have one player fight the final Boss while the other player fights the other enemies.