What is Kingdom Hearts X

Sorry, no answer. There is no such thing as Kingdom Hearts X.

There is only:
- Kingdom Hearts
• Kingdom Hearts Final Mix
- Kingdom Hearts: Chain of Memories
~ Kingdom Hearts Re:Chain of Memories
- Kingdom Hearts II
• Kingdom Hearts II Final mix
- Kingdom Hearts: Birth By Sleep
• Kingdom Hearts: Birth By Sleep Final Mix
- Kingdom Hearts CODED
~ Kingdom Hearts Re:CODED
- Kingdom hearts 358/2 Days
- Kingdom Hearts: 3D Dream Drop Distance
• Kingdom Hearts 1.5 HD ReMIX - Will include both Kingdom Hearts Final Mix and Re:Chain of Memories in high-definitions and trophy support. Additionally, the collection will feature a collection of HD remastered cinematic scenes from Kingdom Hearts 358/2 Days within the compilation's Theater Mode; Is not yet released, but has been announced for release
- Kingdom Hearts III; Is not released, but is confirmed for development

However, there is a Final Fantasy X