[6] After his departure from Blizzard, Roper co-founded and held the position of CEO for Flagship Studios, the developer of Hellgate: London and Mythos (which was later released by HanbitSoft).

[7] In early 2008, amidst rumors of layoffs within the company,[8] the company dissolved and lost the rights to both Mythos and Hellgate: London to Hanbitsoft and Comerica[9] respectively, after it secured financing with Texas-based Comerica Bank to support the continuing development of its franchises.

[11] In November 2008 Roper joined Cryptic Studios as Design Director and Executive Producer of their newest project, Champions Online.

[16] While in this role, his Core Games group released Epic Mickey 2: The Power of Two, Fantasia: Music Evolved, and Disney Infinity, the latter quickly rising to high levels of critical and commercial success.

[18] In an interview with VentureBeat, Bill Roper unveiled the name of a new studio he founded, Lunacy Games, which is currently developing an "open world survival RPG set in the post-apocalyptic American West" as well as a sequel to 2007's Hellgate: London, codenamed Hellgate: Redemption[19] Roper was named #41 in IGN's Top 100 Game Creators of All Time.