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Gran Turismo 2, commonly abbreviated GT2) is a racing game for the Sony PlayStation. Gran Turismo 2 was developed by Polyphony Digital and published by Sony Computer Entertainment in 1999. It is the sequel to Gran Turismo. It was well-received publicly and critically, shipping 1.71 million copies in Japan, 20,000 in Southeast Asia, 3.96 million in North America, and 3.68 million in Europe for a total of 9.37 million copies as of April 30, 2008,[1][2] and eventually becoming a Sony Greatest Hits game. The title received an average of 93% in Metacritic's aggregate. Gran Turismo 2 was also the first PS1 game to be emulated on the Dreamcast via Bleemcast.

Credit to: Wikipedia®

Gran Turismo 4, commonly abbreviated GT4) is a 2004/05 racing video game, and the fourth installment in the Gran Turismo series. It is also the final game to support the Sony PlayStation 2. It was developed by Polyphony Digital and published by Sony Computer Entertainment and was released on December 27, 2004 in Japan and Hong Kong (NTSC-J), February 22, 2005 in North America (NTSC-U/C), and March 9, 2005 in Europe (PAL), and has since been re-issued under Sony's 'Greatest Hits' line. Gran Turismo 4 is one of only four titles for the PlayStation 2 that is capable of 1080i output, for another release being Tourist Trophy which was also created by Polyphony Digital, and based heavily on the physics engine of GT4.

GT4 was delayed for over a year and a half by Polyphony Digital, and had its online mode removed (later added in Gran Turismo online test version). Gran Turismo has held the title of being the number one seller and highest production Polyphony Digital has ever seen. The game features over 700 cars from 80 manufacturers, from as early as the 1886 Daimler Motor Carriage, and as far into the future as concepts for 2022. The game also features 51 tracks, many of which are new or modified versions of old Gran Turismo favorites, with some notable real-world additions.

The Chinese, Japanese, and South Korean versions of the game were bundled with a 212-page driving guide and lessons on the physics of racing. A limited edition, Gran Turismo 4 Online test version, was released in Japan in summer 2006. A PSP enhanced port entitled Gran Turismo Mobile was originally planned for development, but was later renamed to Gran Turismo, which was released October 1, 2009. The follow-up game, Gran Turismo 5, was released in 2010 exclusively for the PlayStation 3.

Credit to: Wikipedia®

O2Jam (Korean: 오투잼) is a casual rhythm-matching online game developed in South Korea by O2Media. At present there are agencies in many countries and regions.