Rush City is a six-issue comic book limited series published monthly by DC Comics from September 2006 until 2007.
 The series is written by Chuck Dixon with illustrations by Timothy Green II colored by Jose Villarrubia.
 DC Comics produced a special Zero issue web-comic that is available on the DC Comics website, and was packaged with the August 2006 issue of the GamePro magazine.
 The title features Diego Zhao, an Asian American private investigator who goes by the street name of Rush.
 Although the series is a crime drama, it does however take place within the continuity of the greater DC Universe.
DC Universe Online: Legends is a comic book limited series published by DC Comics.
 It debuted on February 2, 2011, and is an expansion of the story of the "DC Universe Online" MMORPG video game.
 The series was written by the game's story co-writer Marv Wolfman and Tony Bedard with Tom Taylor penning issues 16 and 17.
 Originally announced as a 52-issue yearlong weekly series, it was instead solicited as a biweekly series slated to have 26 issues.
 Although, solicitations for "DC Universe Online: Legends", along with many other comics, were dropped from the DC Comics website and Diamond/Alliance pre-order catalogs beginning September 2011 as part of DC's new continuity reboot, the remaining issues returned to the publisher's lineup with the October 2011 solicitations.
 By August 2012, three paperback books were published collecting the series.
Batman Eternal is a year-long weekly limited series published by DC Comics, that began in April 2014.
 The series featured Batman, his allies, and Gotham City, and was written by Scott Snyder, James Tynion IV, Ray Fawkes, Kyle Higgins and Tim Seeley.
 John Layman was originally scheduled to write for the series as well, before leaving the project in January 2014 and being replaced by Higgins; his final issue was issue 10.
 "Batman Eternal" ran through April 2015, after which it took a hiatus, before returning in October 2015 for a 26-issue weekly sequel series titled "Batman and Robin Eternal".
Spyke is a 4 issues comic-book limited series created by Mike Baron (writer) and Bill Reinhold (penciller), and published in 1993 by the Marvel Comics imprint Epic Comics.
 Marie Javins was the editor for the series.
John Higgins (born 1949) is an English comic book artist and writer.
 He did significant work for "2000 AD", and he has frequently worked with writer Alan Moore, most notably as colourist for "Watchmen".
In the field of comic books, a limited series is a comics series with a predetermined number of issues.
 A limited series differs from an ongoing series in that the number of issues is finite and determined before production, and it differs from a one shot in that it is composed of multiple issues.
 The term is often used interchangeably with miniseries (mini-series) and maxiseries (maxi-series), usually depending on the length and number of issues.
 In Dark Horse Comics' definition of a limited series, "This term primarily applies to a connected series of individual comic books.
 A limited series refers to a comic book series with a clear beginning, middle and end."
 Dark Horse Comics and DC Comics refer to limited series of two to eleven issues as miniseries and series of twelve issues or more as maxiseries, but other publishers alternate terms.
Stanley and His Monster was an American comic-book humor feature and later series from DC Comics, about a boy who has a monster as his companion instead of a dog.
 Created by writer Arnold Drake and artist Winslow Mortimer as a backup feature in the funny-animal comic "The Fox and the Crow" #95 (Jan. 1966), it went to its own 1960s title and a 1990s revival limited series.
Girl Comics is the name of two comic-book series published by Marvel Comics and its forerunners, Timely Comics and Atlas Comics.
 The first, debuting in 1949, ran 35 issues, changing its title to Girl Confessions with issue #13 (March 1952).
 The second was a three-issue limited series published in 2010.
Watchmen is an American comic-book limited series published by DC Comics in 1986 and 1987, and collected in 1987.
 The series was created by a British collaboration consisting of writer Alan Moore, artist Dave Gibbons, and colorist John Higgins.
 "Watchmen" originated from a story proposal Moore submitted to DC featuring superhero characters that the company had acquired from Charlton Comics.
 As Moore's proposed story would have left many of the characters unusable for future stories, managing editor Dick Giordano convinced Moore to create original characters instead.
"Watchmen" is a twelve-issue comic book limited series created by Alan Moore, Dave Gibbons, and John Higgins, published by DC Comics in 1986 and 1987. "
Watchmen" focuses on six main characters: the Comedian, Doctor Manhattan, the Nite Owl, Ozymandias, Rorschach, and the Silk Spectre.
 These characters were originally based on the Mighty Crusaders and then reworked in an unsolicited proposal to fit superhero properties DC had acquired from Charlton Comics in the early 1980s.
 Series writer Alan Moore created the main characters to present six "radically opposing ways" to perceive the world, and to give readers of the story the privilege of determining which one was most morally comprehensible.

Question: which American comic-book limited series published by DC Comics was John Higgins a colourist for
Answer: Watchmen