NieR: Automata offers exciting optional content through its DLC, 3C3C1D119440927. After downloading and progressing slightly, you'll receive a mysterious letter containing coordinates leading to three challenging Colosseums, each with six ranks of increasingly difficult enemies. Here's how to locate them:
Trial of the Sand Colosseum:
Located in the desert. From the "Desert: Center" access point, zoom out and look to the right (facing the desert entrance) for an orange diamond marking its location. A machine guards the entrance, but it poses no threat. Completing Rank S rewards the Destroyer Outfit (A2).
Gambler's Colosseum:
Found in the Flooded City. Begin at the "Flooded City: Coast" access point. Follow the path towards the coast (the same route used to protect the resource ship). At the end, look right for a waterfall. Circle around the building to the left, finding a Resistance member guarding the entrance. Bribe them with 1,000 G to enter. Rank S completion rewards the Revealing Outfit (2B).
Underground Colosseum:
Accessible only while playing as 9S. Start at the "Forest Zone: Center" access point. Follow the left edge of the forest until you find machines training near a large waterfall. Pass through the waterfall to access the colosseum. Completing Rank S grants the Young Man's Outfit (9S).
Each Colosseum presents a rewarding challenge, offering unique cosmetic rewards for mastering all six ranks.
