Bad Ending
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 Points
On level 3 after defeating the boss use your special weapon before he hits the ground You will get a bonus of 5000 points Be sure to save your weapon until you defeat him
Extra continues
Press LeftLeftBBBCCC Start at 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
Final Boss Duel
When you get to the final boss playing 2player mode have one player choose yes and the other choose no You will be forced to duel against each other
Get Bad Ending
Choose to be Mr Xs righthand man the first time you meet him Then
complete the game
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