The sequel, Rainbow Islands, is similar in concept to the original, although it's a one player-only game, and you create rainbows instead of bubbles. This time, bubble dragons Bub and Bob must go through seven worlds to discover the true meaning of life (uh-huh). The game's highlight is the rainbow, which has multiple uses. You can shoot a rainbow at an enemy, you can trap it inside, or you can drop a rainbow on it from the air. If a rainbow hits a baddie when fired, it becomes a fruit or powerup. If a rainbow is landed on, the rainbow falls and anything it hits becomes a diamond or powerup. If a rainbow is bounced on, it serves as a platform. The tip of the rainbow is a star, and any hidden item the star touches becomes revealed. A lot of fun to play, although somehow Rainbow Islands doesn't have the same simplistic, elegant charm as its predecessor. Both are very good action/puzzle games that are must-haves for everyone who likes addictive, charming action.