Only a few days ago, AMD worked with Fortnite Creative Island modder MAKAMAKES to create the custom AMD Battle Arena in Fortnite creative. Players have the option of playing three different game modes, and among the maps, there apparently was a baked-in Easter egg referencing Big Navi model numbering, or at least so it seems.

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Source: Hot Hardware – Big Navi Radeon 6000 Branding Unearthed In AMD Custom Fortnite Map And How To Find It