At the boss on the last level have one person answer NO to his question and the other answer YES. You will then fight and the person who said no must win. Then he asks again and you answer NO. After you kill him you have the bad ending.
Bonus
On Level 3 after defeating the boss use your special power before he hits the ground and you will get a 5,000 point bonus! be sure to save your power till you defeat the boss.
Defeating boomerang boos
When he throw boomrange,you should flee of boomrang and attack him.and imprison and strike him.do this instruction until he is died. warning: try imprison of back because when backaround boomerang to you,don't injure you.
Easier And Harder Game
At the title screen, hold A + B on Controller Two and press START on Controller One. You can now choose EASIEST and MANIA difficulties.
Extra Continues
Press L, L, B, B, B, C, C, C, Start st the title screen.
Extra Life
When you complete a stage, and before the points start totaling up. Press: START and you will gain an extra life. NOTE: You can only go to 9 extra lives.
Extra Options
At the player & option screen, move the cursor to options, BUT DO NOT SELECT IT! Hold A, B, C, & Right
on controller 2 and press Start on controller 1. Now
look for 2 new options, "Players" and "Level Select".
Fight To The Death
To fight your partner in a two-player game, make your way to the final level. When the boss asks if you want to be his right-hand man, have player one say NO and player two say YES.
One Boss With Two Players
When you start the game, don't select two player mode. Instead, when the first player drops from the sky, have player two press start. Now there will only be one boss.
Throw Some One/ and / Land From a Throw
While playing the game, if you want to throw someone, get behind them and move to where you grab them from behind. Hold back and press B. This works really well with bosses. With normal enemies, it can take up to 50% of their health. I also have another hint. If you are picked up and thrown, and you dont want to fall and lose damage, while in the air, hold up and C and you should land normal just as if you jumped, and you wont have any damage dont to you. This is very helpful if you are playin a hard boss that throws you as one of his good moves.