There are 13 games in the Kingdom Hearts timeline.
How to Play the Kingdom Hearts Games in Order - IGN
Walkthrough - Kingdom Hearts 2 Guide - IGN
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Kingdom Hearts - IGN
Kingdom Hearts - IGN
How to Play the Kingdom Hearts Games in Order
Kingdom Hearts Fans Upset at IGN again..
Never again should I read ign comments again : r/KingdomHearts
Kingdom Hearts 4: Everything We Know So Far
How Kingdom Hearts 3's Desire and Power Choices Affect Your Stats - IGN
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Kingdom Hearts - Wikipedia
Kingdom Hearts II - IGN
If you've played them, it makes sense that that's the order they happened in. : r/Gamingcirclejerk