Old puzzle, three settings, one constant.
The classic Lo Shu 3×3 (target 15) and a Dürer-derived 4×4 (target 34). Pick how many numbers start filled in — easy, medium, hard — and place the rest. Duplicates highlight in red as you go.
Hints reveal one correct cell from the underlying solution. Best times saved per
difficulty:size in localStorage. Arrow keys to navigate, numbers
to fill, Backspace to clear.
⚙️ Settings & Customization
- Theme
- Language
- Size
- Transparent background
- 🎨 Accent Color
📖 How to embed in Notion
- Copy the embed link from the sidebar on the right.
- Open the Notion page you want the widget on and type
/embed. - Paste the link into the embed dialog and press
Embed link. - Drag the embed's bottom edge to resize it to taste.
🆕 What's new in v1.1
- ✦ Lo Shu 3×3 and Dürer 4×4 grids
- ✦ Easy / Medium / Hard — different givens, different hint budgets
- ✦ Live duplicate detection in red
- ✦ Best time saved per difficulty + grid size
- ✦ Arrow-key navigation with H for hint, N for new puzzle
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