---
title: "Pointing Triple: Sudoku Technique #6 | Sudoku Flow"
description: "Pointing Triple: If a number in a box can only go on one line, that candidate is removed from the rest of that line outside the box."
url: https://sudokuflow.com/lessons/pointingTriple/
language: en
---

[Sudoku technique lessons](https://sudokuflow.com/lessons/) / Pointing Triple

Lesson 6

# Pointing Triple

## The rule

If a number in a box can only go on one line, that candidate is removed from the rest of that line outside the box.

## Step by step

1. In this box, every cell where 3 can still go lies in the same row.
2. So we can remove the candidate 3 wherever it appears in that row outside this box.

[Read the full lesson, with more examples →](https://sudoku.rubigogames.com/techniques/pointing-triple.html) [Watch on YouTube](https://youtube.com/shorts/E9xahUpVSYE)

In our app, when this technique is the next step, the hint names it and shows you why, step by step. No ads, free to download.

[App Store iPhone, iPad, Mac](https://apps.apple.com/app/apple-store/id6502922368?pt=125379530&ct=sudokuflow_cta&mt=8) [Google Play Android](https://play.google.com/store/apps/details?id=com.rubigogames.sudoku&referrer=utm_source%3Dsudokuflow%26utm_medium%3Dcta%26utm_campaign%3Dlesson)

## Try it on more boards

Each board is a real puzzle from our app, at a moment where Pointing Triple applies. Find the step yourself, or tap Hint and the app's own hint walks you through it.

Pointing Triple practice board:

```text
1  8  9* | .  2  7  | 5  .  .
3  2  7  | 5* .  6  | .  .  .
.  .  .  | 1  .  9* | .  2  7*
---------+----------+---------
.  .  2  | .  .  .  | 7  .  .
7  .  .  | 9  1  5  | .  3  .
.  3* .  | 7* 6  2  | .  9  .
---------+----------+---------
.  .  .  | .  7* 3  | .  .  .
.  7* .  | .  5  .  | .  .  .
6  5* 3  | 2* 9* 1* | 4  7  8
```
Digits marked * were filled in by a player; the others were printed with the puzzle.

![Sudoku app icon](https://sudokuflow.com/assets/app-icon.png)

## Want more boards like this?

We also make a Sudoku app for iPhone, iPad, Mac and Android. There are no ads in it at all, it works offline, and when you ask for a hint it shows you the technique instead of just filling in a number.

[App Store iPhone, iPad, Mac](https://apps.apple.com/app/apple-store/id6502922368?pt=125379530&ct=sudokuflow_web&mt=8) [Google Play Android](https://play.google.com/store/apps/details?id=com.rubigogames.sudoku&referrer=utm_source%3Dsudokuflow%26utm_medium%3Dweb%26utm_campaign%3Dsite)

Sudoku Flow is made by Rubigo Games, the developer of the Sudoku app recommended on this site.