Question: What 2003 American superhero film was X-Men: The Official Game based on?

Context paragraphs:
X-Men: Days of Future Past: X-Men: Days of Future Past is a 2014 American superhero film based on the fictional X-Men characters that appear in Marvel Comics.  Directed by Bryan Singer, it is the seventh installment of the "X-Men" film series and acts as a sequel to both 2006's "" and 2011's "".  The story, inspired by the 1981 "Uncanny X-Men" storyline "Days of Future Past" by Chris Claremont and John Byrne, focuses on two time periods, with Wolverine traveling back in time to 1973 to change history and prevent an event that results in doom for both humans and mutants.  The film features an ensemble cast, including Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Halle Berry, Anna Paquin, Ellen Page, Peter Dinklage, Ian McKellen and Patrick Stewart.  Simon Kinberg wrote the screenplay from a story conceived by Jane Goldman, himself, and Matthew Vaughn.

X-Men Origins: Wolverine: X-Men Origins: Wolverine is a 2009 American superhero film based on the Marvel Comics fictional character Wolverine, distributed by 20th Century Fox.  It is the fourth installment of the "X-Men" film series and the first spinoff of its standalone Wolverine trilogy.  The film was directed by Gavin Hood, written by David Benioff and Skip Woods, and produced by and starring Hugh Jackman.  It co-stars Liev Schreiber, Danny Huston, Dominic Monaghan and Ryan Reynolds.  The film is a prequel/spin-off focusing on the violent past of the mutant Wolverine and his relationship with his half-brother Victor Creed.  The plot details Wolverine's childhood as James Howlett (Troye Sivan), his early encounters with Major William Stryker, his time with Team X, and the bonding of Wolverine's skeleton with the indestructible metal adamantium during the Weapon X program.

X-Men: The Last Stand: X-Men: The Last Stand is a 2006 superhero film, based on the X-Men superhero team introduced in Marvel Comics.  The film, distributed by 20th Century Fox, is the sequel to 2003's "X2" and the third installment in the "X-Men" film series.  It was directed by Brett Ratner, written by Simon Kinberg and Zak Penn, and features an ensemble cast, including Hugh Jackman, Halle Berry, Ian McKellen, Famke Janssen, Anna Paquin, Kelsey Grammer, James Marsden, Rebecca Romijn, Shawn Ashmore, Aaron Stanford, Vinnie Jones, and Patrick Stewart.  The film's script is loosely based on two "X-Men" comic book story arcs: "The Dark Phoenix Saga" by writer Chris Claremont and artist John Byrne, and "Gifted" by writer Joss Whedon and artist John Cassaday, with a plot that revolves around a "mutant cure" that causes serious repercussions among mutants and humans, and on the resurrection of Jean Grey.

X2 (film): X2 (often promoted as X2: X-Men United and internationally as X-Men 2) is a 2003 American superhero film based on the X-Men superhero team appearing in Marvel Comics.  It is the sequel to 2000's "X-Men", and the second installment in the "X-Men" film series.  The film was directed by Bryan Singer, written by Michael Dougherty, Dan Harris, and David Hayter, and features an ensemble cast including Hugh Jackman, Patrick Stewart, Ian McKellen, Halle Berry, Famke Janssen, James Marsden, Rebecca Romijn-Stamos, Brian Cox, Alan Cumming, Bruce Davison, Shawn Ashmore, Aaron Stanford, Kelly Hu, and Anna Paquin.  The plot, inspired by the graphic novel "", pits the X-Men and their enemies, the Brotherhood, against the genocidal Colonel William Stryker (Brian Cox).  He leads an assault on Professor Xavier's school to build his own version of Xavier's mutant-tracking computer Cerebro, in order to destroy every mutant on Earth and to save the human race from them.

X-Men: Apocalypse: X-Men: Apocalypse is a 2016 American superhero film based on the fictional X-Men characters that appear in Marvel Comics.  It is the ninth installment in the "X-Men" film series and a sequel to "".  Directed by Bryan Singer, with a screenplay by Simon Kinberg from a story conceived by Singer, Kinberg, Michael Dougherty and Dan Harris, the film stars James McAvoy, Michael Fassbender, Jennifer Lawrence, Oscar Isaac, Nicholas Hoult, Rose Byrne, Tye Sheridan, Sophie Turner, Olivia Munn and Lucas Till.  The ancient mutant En Sabah Nur awakens in 1983 and plans to wipe out modern civilization and take over the world, leading the X-Men to try to stop him and defeat his team of renegade mutants.

X-Men (film): X-Men is a 2000 American superhero film based on the Marvel Comics superhero team of the same name, distributed by 20th Century Fox.  The film, directed by Bryan Singer and written by David Hayter, features an ensemble cast that includes Hugh Jackman, Patrick Stewart, Ian McKellen, Halle Berry, Famke Janssen, James Marsden, Bruce Davison, Rebecca Romijn-Stamos, Ray Park, Tyler Mane, and Anna Paquin.  It depicts a world in which a small proportion of people are mutants, whose possession of superhuman powers makes them distrusted by normal humans.  The film focuses on the mutants Wolverine and Rogue as they are brought into a conflict between two groups that have radically different approaches to bringing about the acceptance of mutant-kind: Professor Xavier's X-Men, and the Brotherhood of Mutants, led by Magneto.

X-Men: Dark Phoenix: X-Men: Dark Phoenix is an upcoming American superhero film based on Marvel Comics' X-Men characters, distributed by 20th Century Fox.  It is intended to be the thirteenth installment in the "X-Men" film series, and the beginning of a new "X-Men" trilogy.  The film is being written and directed by Simon Kinberg, and is set to star James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Tye Sheridan, Sophie Turner, Alexandra Shipp, Kodi Smit-McPhee, Evan Peters, and Jessica Chastain.  In "X-Men: Dark Phoenix", the X-Men must face the full power of the Dark Phoenix as well as the alien Shi'ar empire.

X-Men (film series): X-Men is an American superhero film series based on the fictional superhero team of the same name, who originally appeared in a series of comic books created by Stan Lee and Jack Kirby and published by Marvel Comics.  20th Century Fox obtained the film rights to the characters in 1994, and after numerous drafts, Bryan Singer was hired to direct "X-Men" (2000) and its sequel, "X2" (2003), while Brett Ratner directed "" (2006).

X-Men: First Class: X-Men: First Class (stylized onscreen as X: First Class) is a 2011 American superhero film, based on the X-Men characters appearing in Marvel Comics.  It is the fifth installment in the "X-Men" film series.  It is both a prequel and a soft reboot of the franchise, the film was directed by Matthew Vaughn and produced by Bryan Singer.  The story is set primarily in 1962 during the Cuban Missile Crisis, and focuses on the relationship between Professor Charles Xavier (James McAvoy) and Erik Lehnsherr / Magneto (Michael Fassbender), and the origin of their groups—the X-Men and the Brotherhood of Mutants, respectively, as they deal with the Hellfire Club led by Sebastian Shaw (Kevin Bacon), who is bent on world domination.  The film co-stars Rose Byrne, January Jones and Oliver Platt.  The film also introduces new actors to the series including Nicholas Hoult and Jennifer Lawrence who, like McAvoy and Fassbender, reimagine popular characters from the franchise (Beast and Mystique) that have already been established in previous films, namely the original trilogy.

X-Men: The Official Game: X-Men: The Official Game (also known as X3: The Official Game) is Activision's tie-in video game to the 2006 film "".  The game covers the events of the films "X2" and "", specifically following the characters of Wolverine, Iceman, and Nightcrawler.  It also bridges the gap between the two films, explaining why Nightcrawler is not present for "The Last Stand", and also introduces new foes to the "X-Men" film canon, such as HYDRA.

Supporting paragraphs: X-Men: The Official Game X2 (film)
Answer: X2