Namco Museum Remix is a part of the Namco Museum series of arcade compilations. In common with them, it includes a collection of classic arcade titles; however, these are ports, rather than being emulated, and are presented in the same style as in Namco Museum Battle Collection for the PlayStation Portable. Remix also adds five titular "Remix" versions, with updated graphics and gameplay, which differs from the originals, in some cases significantly (for example, in Galaga Remix, players not only have to protect themselves, but also protect Pac-Man as he rolls through space). The "Remix" games feature Miis, and each minigame is presented as an "attraction" in an amusement park—in fact, when released in Japan, the compilation was retitled "Minna de Asobou! Namco Carnival" (みんなで遊ぼう!ナムコカーニバル lit. "Everybody Plays! Namco Carnival").
This collection marks the first appearances of the arcade versions of Super Pac-Man and Gaplus since Namco Museum Vol. 2 for the PlayStation, as well as the first ever U.S. Namco Museum appearances of Cutie Q (which appeared in the Japanese version of Namco Museum Vol. 2) and Pac & Pal (which was released in arcades in Japan only).
Source: Wikipedia, "Namco Museum Remix", available under the CC-BY-SA License.