Cloud is a 2005 puzzle video game developed by a team of students in the University of Southern California's (USC) Interactive Media Program.

Chen and producer Kellee Santiago went on to co-found the studio Thatgamecompany, which has considered remaking Cloud as a commercial video game.

Cloud, a single-player video game for Microsoft Windows, centers on a boy who dreams of flying through the sky while asleep in a hospital bed.

[2] Cloud was designed and released in 2005 by a team of seven students in the Interactive Media master's degree program at the USC School of Cinematic Arts.

[3][5] The group was headed by Jenova Chen and included Stephen Dinehart, Erik Nelson, Aaron Meyers, Glenn Song, composer Vincent Diamante, producer Kellee Santiago and advisor Tracy Fullerton, director of the Game Innovation Lab.

[7] In the early stages of development, the game had an involved backstory about an alien who attempts to clean up the environment, but this was cut down to "a simple 'poetic' introduction to the cloud child trapped in a hospital bed".

[4] The game immediately received a great deal of attention when it was released; site traffic overran the server that hosted the website, and then crashed those of the school.

Joel Durham, Jr. of GameSpy claimed that "everything about Cloud is simply jaw-dropping", and cited its music, visuals, and sensation of flying as high points.

[12] William Usher of Game Tunnel also praised the visuals and audio: he believed that its graphics created a relaxing atmosphere, and that the "touching musical score" would emotionally move any player.