Shark! Shark!

Shark! Shark! is an Intellivision game originally designed by Don Daglow, and with additional design and programming by Ji-Wen Tsao, one of the first female game programmers in the history of video games. The player is a fish who must eat smaller fish in order to gain points and extra lives while avoiding enemies such as larger fish, sharks, jellyfish, lobsters and crabs. After eating a certain number of fish, the player's fish grows in size and is thus able to eat a larger selection of fish. However, while the larger fish becomes a bit faster, he is less agile than the small fish and has a harder time avoiding enemies.

Shark! Shark! was originally considered by Mattel to be a cute game for kids and unlikely to make strong inroads into the gaming community. However, the market caught Mattel unprepared when it fully embraced the game as a sorely needed Intellivision original. The game's popularity skyrocketed, forcing Mattel to quickly manufacture another batch of cartridges. The original cartridge run was only 5,600 units.