Same starting conditions. Different choices. Prove your city can balance prosperity, housing, citizen well-being and public finances. Save your game locally and submit it for review.
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Select a listed challenge for its specific city, seed, target year and prize description.
Begin the challenge, select any original universe, and play normally. At the target year, save your complete game with “Save JSON”.
Only matching saves from the same scenario, seed, engine and final year can be scored. A replay-valid submission is provisional until an operator approves it.
Save the entry ID and private receipt code. This is not an official prize approval. You will need the code to check review status or claim an organizer-selected prize.