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Monster Kingdom: Jewel Summoner was the first game produced by Gaia. Gaia also assisted Game Republic with Folklore's monster-creation system, and its original title was Monster Kingdom: Unknown Realms. Another Gaia game, Coded Soul: Uketsugareshi Idea, was released in 2008 with numerous gameplay elements in common with both Jewel Summoner and Folklore. The developer's website was inactive in 2010, suggesting it closed and its final project, Cosmic Walker for the Wii, was cancelled despite Nintendo's support in the project.