FusionFall

Cartoon Network Universe: FusionFall was a massively multiplayer online game developed by Cartoon Network and South Korean studio Grigon Entertainment, released on January 13, 2009. The game took place within an amalgamation of Cartoon Network settings that included characters and locations from established shows as well as some unique additions, following a science fiction genre. FusionFall used the Unity engine as its client technology basis.

For the first year, the full game required a subscription; free accounts could only access a portion of the content. On August 29, 2013, the game's servers were shut down. It was unofficially revived by fans as two different games in 2017, the first being FusionFall: Retro (a revival of the original game) and the second being the unreleased FusionFall: Legacy (the original game plus additional content). On April 16, 2020, Cartoon Network issued a DMCA takedown notice to the developers of the games, resulting in Retro being removed entirely and Legacy's cancellation.