NumberPlaceNet User Guide: Basics of Number Place (a 9×9 logic puzzle)

This guide explains the three basic operations for Number Place (a 9×9 logic puzzle) on our site: entering numbers, taking notes, and erasing entries.

1. Entering numbers (confirmed answers)

   This operation inserts a large confirmed number into a cell.

   • Step 1: Check mode
     Ensure the "Note" button is off (normal mode).
   • Step 2: Select a cell
     Click or tap the empty cell where you want to enter a number.
   • Step 3: Enter number
     Press a number button from 1 to 9 at the bottom of the screen to insert a large number into the selected cell.
2. Taking notes (candidate numbers)

   This operation inserts small candidate numbers (notes) into a cell. Multiple numbers can be noted in a single cell. This is an important technique for solving Number Place puzzles.

   • Step 1: Switch mode
     Click the "Note" button to switch to note mode.
   • Step 2: Select a cell
     Select the empty cell where you want to add notes.
   • Step 3: Enter notes
     Press the numbers 1 to 9 at the bottom of the screen to insert them as small notes in the selected cell.
3. Erasing numbers or notes

   There are two ways to erase entered numbers or notes.

   • Method A: Erase by pressing the same number
     Select a cell with a number, then press the same number button at the bottom again to remove it.
   • Method B: Erase with the eraser
     Select the cell you want to erase, then press the "Eraser" button to remove all numbers or notes in that cell.

   Combine these actions to comfortably solve Number Place puzzles.

How to Play and Rules of Number Place

Number Place is a simple yet deep logic puzzle game. Anyone can enjoy it by understanding the basic rules.

Rules

• Grid: The game uses a 9×9 square grid, which is divided into nine 3×3 blocks (outlined with bold lines).
• Numbers used: Numbers from 1 to 9 are used.
• Filling cells: Fill each empty cell with a number from 1 to 9.
• Restrictions (no duplicates):
  • Row: Each row must contain the numbers 1 to 9 exactly once.
  • Column: Each column must contain the numbers 1 to 9 exactly once.
  • Block: Each 3×3 block must contain the numbers 1 to 9 exactly once.

Basics and Tips for Solving Number Place

Here are the basic approaches and tips to solve Number Place puzzles smoothly.

Basic solving steps

• Eliminate candidates: Check which numbers are already used in the row, column, and block of a cell, and remove them from the candidates.
• Confirm numbers: Fill in cells that have only one candidate number first.
• Impact on other cells: Entering a number in one cell further limits the candidates in the same row, column, and block, which leads to the next logical decision.

Tips

• Start with areas with fewer options: Begin with rows, columns, or blocks that already have many numbers filled; this reduces candidates and makes solving easier.
• Pencil notes: For beginners, noting possible numbers in empty cells is helpful. Please use the site’s note function.
• Review: If you get stuck, check for duplicate numbers and ensure the rules are followed.

Remember one main rule:
Do not duplicate numbers in the same row, column, or 3×3 block.
Keep this in mind while challenging yourself with Number Place.

Number Place – Frequently Asked Questions (FAQ)

Q1. Are new puzzles updated daily?

A. Yes. A new Number Place puzzle is updated every day at midnight. Multiple difficulty levels are available from beginner to advanced.

Q2. Is there an undo function if I make a mistake?

A. Yes. By pressing the "Back" button (left arrow) at the bottom of the screen, you can undo your last action. You can undo multiple times, so feel free to use it.

Q3. I am stuck. Are there hints available?

A. Currently, this site does not provide a specific "next move" hint feature. Please refer to the solving tips to narrow candidates and review your entries.

Q4. Can I add the site to my smartphone home screen like an app?

A. Yes. You can use the browser’s feature (iPhone: "Share" → "Add to Home Screen", Android: menu → "Install") to access it quickly like an app (PWA feature).

Q5. How can I play past puzzles?

A. Click the "Past Puzzles" button at the top of the screen to open a calendar, then select the date of the puzzle you want to solve.

Q6. What strategies are needed for advanced puzzles?

A. Advanced puzzles require techniques such as "Hidden Single", "Naked Pair", and "X-Wing".

Q7. Are ads displayed during play?

A. Since this service is free, ads are shown to cover operating costs. We appreciate your understanding.

Q8. Is my completion time recorded?

A. Currently, there is no time recording or ranking feature. You can enjoy solving Number Place puzzles at your own pace.