NieR: Automata's 3C3C1D119440927 DLC unlocks three challenging Colosseums. After receiving the Mysterious Letter, you'll need to locate these arenas to access their six ranked battles. Here's how to find them:
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Trial of the Sand Colosseum Location
This Colosseum is situated in the desert. From the "Desert: Center" access point, zoom out your view. Look to the right (relative to your entry point) for an orange diamond-shaped structure. A machine guards the entrance, but it poses no significant threat. Inside awaits the Trial of the Sand Colosseum quest.
- Rank S Reward: Destroyer Outfit (A2)
Gambler's Colosseum Location
Access the Gambler's Colosseum from the "Flooded City: Coast" access point. Follow the coastal path, the same route used to protect the resource ship for the resistance. At the path's end, locate a waterfall to your right. Circle around the building to the left of the waterfall; you'll find a Resistance member guarding the entrance. Bribe the guard with 1,000 G to enter and begin the Gambler's Colosseum quest.
- Rank S Reward: Revealing Outfit (2B)
Underground Colosseum Location
9S ONLY: This Colosseum is accessible only when playing as 9S.
Begin at the "Forest Zone: Center" access point. Follow the forest's left edge until you encounter machines training near a large waterfall. Pass through the waterfall to the other side to gain entry.
- Rank S Reward: Young Man's Outfit (9S)