 In the PlayStation version , a mini @-@ game of Galaxian can be played as the game loads . If won , eight additional cars become available . The cars are varied in their specifications ; some feature a high top speed , others excelling at acceleration or turning , and others being more balanced . Certain cars are named after other Namco games such as <unk> , <unk> , <unk> , <unk> , and Xevious . Once the game has loaded , all the CD is needed for is to play six music tracks . The disc can be replaced at any time during gameplay , although the game does not update ; regardless of what disc is inserted , there will always be six tracks , corresponding the starting points of the tracks on the game disc . 
