NieR: Automata's 3C3C1D119440927 DLC unlocks three challenging colosseums after receiving a mysterious letter. This guide details their locations and Rank S rewards.

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• Trial of the Sand Colosseum
• Gambler's Colosseum
• Underground Colosseum

The DLC introduces optional content and cosmetic rewards. The letter provides coordinates leading to three colosseums, each with six progressively difficult ranks.

Trial of the Sand Colosseum

Located in the desert, access this colosseum from the Desert: Center access point. Zoom out and locate the orange diamond-shaped structure to the right of your entry point. Enter freely and begin the Trial of the Sand Colosseum quest.

• Rank S Reward: Destroyer Outfit (A2)

Gambler's Colosseum

Starting from Flooded City: Coast, follow the path towards the coast (the same route used to guard the resource ship). At the end, locate a waterfall to the right. Circle around the building to the left, finding a Resistance member guarding the entrance. Bribe them with 1,000 G to enter and start the Gambler's Colosseum quest.

• Rank S Reward: Revealing Outfit (2B)

Underground Colosseum

9S ONLY: Access this colosseum 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.

• Rank S Reward: Young Man's Outfit (9S)