Press Left,Left,B,B,B,C,C,C, Start at the title screen.
Contributed By: Desert eagle.
Level and Lives Select
Go to the main menu. Hold down (A) + (B) + (C) + RIGHT on controller 2 while selecting Options on controller 1 (best if done with two people). You can now select how many lives you start with and which stage to start on.
Contributed By: NTsui.
Final Boss Duel
When you get to the final boss playing 2-player mode, have one player choose ''yes'' and the other choose ''no''. You will be forced to duel against each other.
Contributed By: MrSoluble.
Receive the Bad Ending.
To get the Bad Ending, you must be playing as 2 players. You must also be in 2 player mode before Level 8 or else player 2 can't come into the game on Level 8. When both players reach Mr. X in the final room and he asks his question, make sure one player answers yes and the second answers no. Mr. X will have both players fight each other to the death. Have one player lose and choose game over. Afterwards, Mr. X will ask a second question. Be sure to answer NO to that question as well to trigger the final boss battle. When you beat him, you will become the Boss. NOTE: If you answer yes, you will again be shut back 2 levels and still not be ale to get the bad ending.
Contributed By: Skarz89.
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