The Origin of Darwin is an online game based off of The Amazing World of Gumball. It is available on the Cartoon Network HQ website.
The game starts on a fish bowl containing one randomly customized fish, while Gumball watches with different expressions. As explained in the instructions of the game, you create a new fish to put into Gumball's fish bowl, by pressing on the green fish plus button. Once you press the green button, the screen will display a menu of options to choose in order to customize your new fish. The customizations include features from different characters of The Amazing World of Gumball. The blue button will randomly customize the features of the new fish. In order to place it into the fish bowl, you press the green fish bowl button, and it will be dropped into it with the already created fish. You can create as many fish as you like. The red button will flush all the fish away, while Richard's Swing Low Sweet Chariot plays in the background.