Easier
During the title screen hold down L & R and press start. The screen will display difficulty 1 and difficulty 2 (difficulty 1 is set at 5 and difficulty 2 is set at 4. Lower both of them to one to make the game easier. You could also put 9 lives instead of 3.

Extra stage
At the start menu hold L and R and press Up, Up, Down, Down, Left, Left, Right, Right

Options Menu
At the title screen, hold L and press Start.

Skip Caine
In round 2 when you start you will see two windows and a pipe. Go to the far right window and grab a guy. After you have done that throw him. You should break the windows and dent the pipe. And when you are done and have moved on, break the rest of the windows. At the end of the stage you will not go on and have to beat the boss Caine.

Super Combo
This super combo can be easily executed with Cody, but it's a bit tougher with Haggar. To begin, initiate a punching combo (press Attack, Attack, Attack for Cody) or (attack, attack for Haggar.) While you're pressing these buttons, hold the d-pad AWAY from your enemy. Before you do your final ending combo blow, you will throw the enemy, delivering massive damage!

NOTE: You can also start this combo with a jumping knee (jump and hold down, press attack) to deal even more damage! (This will not work for Haggar.)

Start off with 9 lives
At the Title screen, enter the following configurations: Hold L and R, press Up, Down, Left, and Right. Then press start.
You should go directly to the options secret options menu. Go to LIVES and switch it to 9. Plus, go to INCREASES EVERY, and switch it to 200,000. That way, you'll start the game with 9 lives and you'll get an extra life every time you get 200,000 points.