NieR: Automata's 3C3C1D119440927 DLC unlocks three challenging coliseums after receiving a mysterious letter. This guide details their locations and Rank S rewards.
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The 3C3C1D119440927 DLC, included in all editions, provides additional content and cosmetic rewards. After some game progression, a mysterious letter with coordinates will appear in your inbox, leading you to three coliseums with six increasingly difficult ranks.
Trial of the Sand Colosseum Location
Located in the desert, access this colosseum from the Desert: Center access point. Zoom out and look right for an orange diamond-shaped structure. A machine guards the entrance, but entry is straightforward. Completing the Trial of the Sand Colosseum quest awards the Destroyer Outfit (A2) for Rank S.
Gambler's Colosseum Location
Starting at Flooded City: Coast, follow the path to the coast (similar to the route used to guard the resource ship). At the end, find a waterfall to the right. Circle around the building to the left, locating a Resistance member guarding the entrance. A 1,000G bribe unlocks access to the Gambler's Colosseum quest, rewarding the Revealing Outfit (2B) at Rank S.
Underground Colosseum Location
This colosseum is accessible only as 9S. From Forest Zone: Center, follow the left forest edge until you find machines training near a large waterfall. Pass through the waterfall to access the Underground Colosseum quest. The Rank S reward is the Young Man's Outfit (9S).