Here are some cheats and tips for the game X-Men.
Level select:
Hold Down + A + C and power on the Genesis.
With those buttons held, hold Start when the “Press
Start” text appears on the opening screen. Continue to hold
the buttons until the difficulty selection screen appears. Select
any difficulty level and character, and walk to the right when
the game play starts. Eight panels representing the eight game
levels will appear on the wall. Crouch in front of a panel and
press C to jump to the corresponding level. Note: This
code will not work if a controller is plugged into port two.
Full life:
Enable the “Level select” code. Select two-player
mode. Hold Down +A + C. Remove the controller
from port one and plug it into port two. Press Start. Select
characters, a starting level, and begin game play. Press Start(2)
for full life.