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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Secondary Games and Puzzles for Summer 2021

### We have a challenge a day for you throughout the summer break...

### Multiples Sudoku

### Square It

### Connect Three

### Got It

### Frogs

### Product SudokuLive

### Add to 200

### Factors and Multiples Game

### Gabriel's Problem

### The Remainders Game

### Diamond Collector

### In the Bag

### Countdown

### Magic Potting Sheds

### Treasure Hunt

### Nine Colours

### Charlie's Delightful Machine

### Finding Factors

### Fruity Totals

### The Number Jumbler

### Alison's Quilt

### Missing Multipliers

### Nice or Nasty

### Difference Sudoku

### ACE, TWO, THREE...

### LCM Sudoku

### Escape from the Castle

### A First Product Sudoku

### Dicey Operations

Or search by topic

Each weekday from 19 July to 31 August, a new game or puzzle will appear on this page.

After you've had a go at the day's challenge you may be able to compare your approach to the solutions we have published, which are based on students' work.

You can also find Primary Games and Puzzles for Summer 2021.

Age 11 to 14

Challenge Level

Each clue in this Sudoku is the product of the two numbers in adjacent cells.

Age 11 to 16

Challenge Level

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.

Age 11 to 16

Challenge Level

In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?

Age 7 to 14

Challenge Level

A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

Age 11 to 14

Challenge Level

How many moves does it take to swap over some red and blue frogs? Do you have a method?

Age 11 to 16

Challenge Level

The clues for this Sudoku are the product of the numbers in adjacent squares.

Age 11 to 14

Challenge Level

By selecting digits for an addition grid, what targets can you make?

Age 7 to 16

Challenge Level

A game in which players take it in turns to choose a number. Can you block your opponent?

Age 11 to 14

Challenge Level

Gabriel multiplied together some numbers and then erased them. Can you figure out where each number was?

Age 7 to 14

Challenge Level

Play this game and see if you can figure out the computer's chosen number.

Age 11 to 16

Challenge Level

Collect as many diamonds as you can by drawing three straight lines.

Age 11 to 14

Challenge Level

Can you guess the colours of the 10 marbles in the bag? Can you develop an effective strategy for reaching 1000 points in the least number of rounds?

Age 7 to 14

Challenge Level

Here is a chance to play a version of the classic Countdown Game.

Age 11 to 16

Challenge Level

Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?

Age 7 to 14

Challenge Level

Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?

Age 11 to 16

Challenge Level

Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?

Age 11 to 16

Challenge Level

Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

Age 14 to 16

Challenge Level

Can you find the hidden factors which multiply together to produce each quadratic expression?

Age 7 to 16

Challenge Level

In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?

Age 7 to 14

Challenge Level

The Number Jumbler can always work out your chosen symbol. Can you work out how?

Age 11 to 14

Challenge Level

Nine squares are fitted together to form a rectangle. Can you find its dimensions?

Age 7 to 14

Challenge Level

What is the smallest number of answers you need to reveal in order to work out the missing headers?

Age 7 to 14

Challenge Level

There are nasty versions of this dice game but we'll start with the nice ones...

Age 14 to 16

Challenge Level

Use the differences to find the solution to this Sudoku.

Age 11 to 14

Challenge Level

Can you picture how to order the cards to reproduce Charlie's card trick for yourself?

Age 14 to 16

Challenge Level

Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.

Age 7 to 14

Challenge Level

Skippy and Anna are locked in a room in a large castle. The key to that room, and all the other rooms, is a number. The numbers are locked away in a problem. Can you help them to get out?

Age 7 to 14

Challenge Level

Given the products of adjacent cells, can you complete this Sudoku?

Age 11 to 14

Challenge Level

Who said that adding, subtracting, multiplying and dividing couldn't be fun?