Fans of the Bust-A-Move puzzle series can look forward to more sleepless months with Natsume's release of Bust-A-Move 4 exclusively for the PlayStation. Once more, the rotund dragons from Taito's Bubble Bobble series find themselves having to restore the color in their monochrome world and return for another round of manic bubble-bursting mayhem. The general premise of Bust-A-Move has remained the same since the game's inception on the Neo Geo back in 1993. In single-player mode, you shoot colored bubbles up into clusters of other bubbles. When a bubble makes contact with two or more bubbles of the same color, they pop. The object of each stage is to pop all bubbles before the timer reaches zero. There is a total of 640 single-player levels, which includes both the arcade and puzzle mode stages