The Final Fantasy 7 timeline can be convoluted, especially with so many spin-offs, so fans should check out where Crisis Core fits into the story.
What is the Final Fantasy timeline? - Quora
Preparing for Final Fantasy VII Rebirth – Who is Zack Fair and what's happening with the timeline? – PlayStation.Blog
Crisis Core Final Fantasy 7 Reunion review
Hard Mode Difficulty in Crisis Core Reunion - Getting Started - Introduction, Crisis Core Final Fantasy VII: Reunion
Before Final Fantasy 7 Rebirth, should I play Crisis Core Reunion?
Compilation of Final Fantasy VII - Wikipedia
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Crisis Core -Final Fantasy VII-, Final Fantasy Wiki
Final Fantasy VII timeline, Final Fantasy Wiki
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FINAL FANTASY VII EVER CRISIS on Steam
PSP game or not, Crisis Core deserves its remaster; it's become an integral part of Final Fantasy 7