Every Sudoku

I'm Ragnar. Earlier this year I shipped FreeCell Classic here. This week I did another one — Every Sudoku — but honestly the game isn't the interesting part. The pipeline is.

The workflow

1. Designed it in Claude Design first — not wireframes, an actual design system ("Industry": steel-blue on a light technical ground, Barlow Condensed over Barlow, square hairline-bordered cards with registration marks) plus mockups of every screen.
2. Handed that export to Claude Code and built the real thing against the exact tokens — same hex values, same spacing, same components. No drift between the mock and the build.
3. Domain, hosting, DNS, SSL — Cloudflare Registrar + Pages, same session.

Design file to live HTTPS domain: one day.

What got built

• Four difficulties: Easy, Medium, Hard, Evil
• Seeded generator with a uniqueness check — every puzzle is verified to have exactly one solution before it's served
• Pencil marks with optional auto-clear, undo, hints, conflict checking
• Full keyboard play (1-9, space for pencil, arrows, Cmd+Z)
• Shareable puzzle links — the same seed regenerates an identical grid
• Printable sheets, optionally with candidate grids or the solution on page two
• Local stats: solve count, best time per difficulty, streak
• Mobile-responsive

Tech stack

Vanilla HTML/CSS/JS. No framework, no build step, zero dependencies — six static files on Cloudflare Pages. No backend, no database, no accounts; your stats never leave your browser. Evil-difficulty generation (backtracking + MRV solver, uniqueness-checked) runs in under 100ms client-side.

What's next

A daily puzzle — one shared grid per day for everyone, plus a no-login leaderboard where you submit a time with just a display name.

Revenue model

None. Same as FreeCell: free, no ads, no login. Players first, monetization later if at all.

Try it: https://everysudoku.com — curious what people make of the Evil generator. What's your best time? 🎯