Golden Axe 2

Level select (PlayStation2, PSP, and Wii emulations):
Note: This code is for the version of the game included in the Sega Genesis Collection for the PlayStation2 and PSP and the Wii Virtual Console version. Hold A + B + C and press Start at the introduction screen. Release B and C, but continue to hold A during the remainder of this code sequence. Highlight the "Option" selection and press B + C. Highlight the "Exit" selection and press B + C. Highlight your choice for the number of players and press B + C. Highlight the "Normal" game mode and press B + C. Highlight a character and press Up + B + C + Start. A number that corresponds to the starting level will appear. Release the A button. Press A or B to change the starting level and press Start to begin game play.
Information in this section was contributed by snazzyhoppy.

Extra continues:
Highlight the "Options" selection on the title screen, hold A + B + C, and press Start. Release A, but keep B and C pressed. Select the game options, including normal game mode, and exit the options menu. Eight credits should be available on the player selection screen.

Full magic:
Enter the options menu and select the "Special Magic" option. Begin game play and Hold A when the music for the Bosses on levels 1 to 4 begins to play. Defeat the Boss while holding A. Release the button when the screen turns black and your character is transported to the bonus level. Do not press any buttons or move the D-pad. When the next level begins, player one will cast a spell that will increase the magic points to 255. Note: Do not use more magic points that what your character normally is allowed to use. Doing so will freeze the game.