Marvel Super Heroes Adventure Gamebook #6
From the back cover:
YOU play the part of not one but FOUR of The Uncanny X-Men, as Wolverine, Storm, Rogue, and Nightcrawler try to save a government think-tank from invading, thinking robots!
MARVEL SUPER HEROES Adventure Gamebooks are based on TSR, Inc.'s popular MARVEL SUPER HEROES role-playing game, but you needn't know the game to enjoy the exciting adventure in this book. All you need to do is get one standard, six-sided die (not included), sharpen your mutant powers, and assume the role of the Uncanny X-Men as they try to avoid their diabolical demise in AN X-CELLENT DEATH.