20-0 Daily Challenge and Leaderboard, Explained

The Daily Challenge is the game’s one shared, comparable format — everyone drafting it on a given day is working from identical options, which makes the leaderboard an actual head-to-head instead of a comparison across unrelated random runs.

How the shared seed works

Every UTC day generates one deterministic seed for the Daily Challenge. Anyone who clicks “Play Daily Challenge” that day — regardless of when during the day they start — gets that exact same seed, which means the exact same sequence of eras spun, candidate pools, and draft options at every round. Your picks are still entirely your own; only the options you’re choosing between are shared.

That’s a meaningfully different experience from a normal free-play run, where your seed is randomly generated and won’t match anyone else’s. If you want to compare a run directly against a specific friend on a non-Daily-Challenge day, use the seed-sharing feature covered in our full rules walkthrough instead — enter their seed to get their exact draft options.

Submitting to the leaderboard

Once your Daily Challenge run reaches the results screen, a submission form appears. Type a display name (don’t use your real name or anything personal — it’s shown publicly), and your regular-season record and letter grade get added to that day’s leaderboard.

Behind the scenes, the server independently recomputes what that day’s seed should be and rejects any submission whose seed doesn’t match — so only genuine Daily Challenge runs can appear on the board, not a strong free-play run someone tries to pass off as one.

The anonymous player ID

The game stores a randomly generated ID in your browser’s local storage the first time you submit anything — not a real account, and never displayed publicly. Its only job is letting you update your own leaderboard entry if you resubmit later that day, instead of piling up duplicate entries under the same name. If you clear your browser storage or switch devices, you’ll get a new ID and a fresh slate.

How long entries last

Each day’s leaderboard is stored separately and automatically expires after 3 days. There’s no permanent, all-time leaderboard — every day is its own contest, which keeps the board fresh and prevents any one exceptional run from dominating the board indefinitely.

A note on privacy

The leaderboard is a genuinely public feature — your display name and record are visible to anyone who loads the page that day. See our privacy policy for the full details on exactly what’s stored and for how long.