possible with up to 14 players racing against each other and downloadable content was available via Microsoft's Xbox Live service. Players can download another player's "ghost" replay from Xbox Live and attempt to beat it. Like other Ridge Racer games, this iteration goes beyond cars to feature other outlandish vehicles as well, called "special machines" in the game. These include a hovercraft (Assoluto Pronzione), a tripod supercar (Himmel 490B) and an oversized SUV that can be very loud (Danver Bass Cruiser). The game, as with all games in the Ridge Racer series, contains copious numbers of references to other Namco games, such as Pac-Man, Soulcalibur, and Ace Combat. The game also features a FMV opening, starring series mascot Reiko Nagase. In Japan, Namco announced that it expected to sell 500,000 copies of Ridge Racer 6 for the Xbox 360, although far fewer copies were actually sold. Ridge Racer 7 for the PlayStation 3 is largely an expanded and enhanced version of Ridge Racer 6; differences include improved resolution and a more vibrant color scheme, new circuits such as Bayside Freeway and Shadow Caves, and new vehicles that were not seen in Ridge Racer 6 such as the Sinseong Jujak from Sinseong Motors, a fictional South Korean brand. There are 15 circuits available, each of which can also be raced in reverse, making a total of 30 circuits. The circuits are split into 5 groups of 3, where the 3 tracks in the same group will overlap. The game was added on the Xbox backward compatible list in November 2021 as part of the Xbox 20th anniversary. The game is playable on Xbox One, S, X and on Xbox Series S&X. Music Ridge Racer 6 is the second game after Ridge Racer (PSP) to feature composers from both the older and newer game sound teams. Hiroshi Okubo served as the game's sound director, while the soundtrack also has contributions from in-house composers Keiki Kobayashi, Rio Hamamoto, Tetsukazu Nakanishi, Yuu Miyake, Koji Nakagawa, Junichi Nakatsuru, and Akitaka Tohyama. Several contractors who formerly worked in-house include the original Ridge Racer sound team consisting of Shinji Hosoe, Ayako Saso, Nobuyoshi Sano, and Takayuki Aihara, as well as Asuka Sakai and Kohta Takahashi, both of whom composed for R4: Ridge Racer Type 4. Music from the previous two games in the series, Ridge Racer (PSP) and R: Racing Evolution, was made available for download through