Are you asking about the server or the mobile RP games that often use similar "Gameworld" branding? 1. Gameworld RP (SAMP Server)
These games offer massive living cities where you can be a racer, business owner, or law enforcer.
Experienced players often remember these 2010–2013 era servers fondly for their peak populations, though some modern reviews of SAMP RP in general suggest a decline in quality and community discipline. 2. Gameworld / "Grand RP" (Mobile Apps)