Kingdom Hearts: Light by Darkness

Kingdom Hearts: Light by Darkness is a fanmade video game for the Sony PSP, whose storyline takes place after the events of Kingdom Hearts II, and during the events of Kingdom Hearts coded.

Story
Taking place after Kingdom Hearts II, and during the events of Kingdom Hearts Re:coded, the game shows the story of what happened to Sora while the events of the Datascape were occuring, as Sora embarks on a new quest. Along with Riku and Sora, they have been given the tasked by Yen Sid in order to seal all Vents, pathways Heartless use to quickly and easily travel from world to world. They are also tasked to vanquish all seven Lightfeeders, Pureblood Heartless that feed off the light of a world.

This quest is a Mark of Mastery pre-exam that Yen Sid ordered to see if Riku and Sora are able to handle what's coming for them. Kairi is also tasked to see if she can handle individual tasks, which Yen Sid may find use for her in the future. And so the three of them travel to different worlds, sealing Vents, demolishing Lightfeeders, and also meeting new characters in new worlds.

World and Characters
This game introduces four new Disney worlds, and the return of several Disney worlds from previous games. It also includes Kingdom Hearts-based worlds, including Castle Oblivion and The World That Never Was.