In BARBIE MERMAID ADVENTURE CD-ROM, Barbie is hosting a magical celebration. Unfortunately, the glimmering rainbow shell that was to provide the lighting for the celebration has faded. Players help Barbie explore three underwater areas to find the three magical dolphins who can relight the rainbow shell.

Players will find routine mazes, a game of Pong, a match-the-pattern game, and an uninspired logic activity about rocking baby fish to sleep. They will collect gems and shells to decorate jewelry and a performance stage. They can arrange a song by placing cute instrument-wielding marine animals in an order that they find pleasing.