X-Men is a video game that was released in 1994 for the Sega Game Gear featuring the X-Men superhero team. In the game, most of the X-Men have been captured by Magneto; only Wolverine and Cyclops survived the initial assault on X-Men headquarters and are available for play at the start of the game. Players rescue the other X-Men and use them and their abilities to defeat Magneto.

Sega released a sequel in 1995, X-Men 2: Game Master's Legacy.

Players defeat enemies and navigate levels by punching, kicking, and jumping. Mutant abilities can be activated and deactivated. However, these mutant abilities drains the energy from the player's character. A new playable character is unlocked after finishing a level, including Storm, Rogue, Psylocke, Nightcrawler and Iceman.

There are several foes from the X-Men universe to defeat including Callisto, Sauron, Sebastian Shaw, Omega Red, a Brood Queen and Magneto. Each boss has their own stage based on various diverse settings from X-Men, including the Morlock Tunnels, the Savage Land, the Hellfire Club, Madripoor, the Brood homeworld and Avalon. These levels are often labyrinths of either technological wonders, biological wonders, or a mixture of both. As more X-Men are rescued, these allies can be called upon to take over as the player's character. Magneto serves as the final boss of the game.