Evolution is a 3D animated online video slot game produced by Net Entertainment. The game has a Sci-Fi/fantasy theme and takes place in an alternate world where strange and wonderful creatures are slowly evolving in the depths of the ocean. Set underwater, the game does not feature reels as such with all the symbols floating gently with the rising ocean currents. The 3D graphics and animation are top-class and work well with the eerie background music. When the spin button is pushed, the symbols float up accompanied by the sounds of bubbles and a rush of water.