Vault Solver — 4-digit code (0–9, repeats allowed)

Enter a guess (one digit per box) and set the per-digit feedback by clicking the small color boxes under each digit: grey, yellow, blue. The digit box will change color to match the feedback.

Enter guess

Quick controls

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History

Suggested next guess

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Info

First 3 guesses maximize discovery of distinct digits. From guess 4 onwards suggestions aim to minimize expected remaining candidates.

Remaining possibilities: 10000

How feedback is computed

Blue = correct digit in correct position
Yellow = digit appears in code but not here (accounting for duplicates)
Grey = digit not present (accounting for duplicates)

Deploying to GitHub Pages

Save as index.html, push to a repo, then enable GitHub Pages in the repo settings (branch: main or gh-pages). No server or build step required.