Can you work out which areas of this diagram represent green flags with red stars but no stripes, and red and green striped flags with no stars?

This cut-out shape can be folded to make a cube. Which of the four cubes below is the only one it could make?

This used to be a big cube made of 125 small blocks measuring 5 by 5 by 5. If all the blocks that are not visible from this angle are present, can you work out how many have been taken away?

1. Complete the grid with zeros and ones until there are just as many zeros and ones in every row and every column.

2. No more than two of the same number can be next to or under each other.

3. Rows or columns with exactly the same content are not allowed.

The numbers on the side and bottom of the grid indicate occupied squares or groups of consecutive occupied squares in each row or column. Can finish the grid so that it contains three Cruisers, three Launches and three Buoys and the numbers tally?

*Each rectangle contains either a battery with a positive (+) and negative (–) pole OR a dud wooden block which does nothing. The numbers along the top and left indicate how many positive poles there are in that row or column; likewise for the other numbers showing the number of negative poles.*

A detective cartoon strip incorporating a taxing problem, based on the tales of Sherlock Holmes by Conan Doyle.

Join the famous detective Sherlock Holmes and his trusty colleague, Doctor Watson, in the many problems, dilemmas, and mysteries they encounter while trying to apprehend the infamous Professor Moriarty and other fiendish felons.

Uncover plots, reveal murderers, unmask liars and recover stolen goods, as you complete these lively logic puzzles, codes, anagrams, number puzzles, and of course, who dunits. Use your deductive powers to right wrongs and prevent crimes, while you deal with the esteemed Inspector Lestrade of Scotland Yard, Mrs. Hudson, Holmes’ household manager, and all the other characters you’ll encounter in and around 221B Baker Street.

Complete the grid so that each row and column contains a red, orange and green light. The lights at the end of each column and row tell you the colour of the red light you will meet if you travel in that direction down the column or row.

Divide the Shikaku grid into rectangles. Each rectangle must contain a single number, and that number must describe exactly how many boxes there are in the rectangle.

Each row and column contains the same number of O and X. The same symbol never appears in three adjacent cells, horizontally or vertically (e.g. ?XX? must be OXXO). Also, each row and each column is unique.

You have four shots in which to get your golf ball upwards from the tee to the hole. Choose one each from the Drive, Iron, Chip and Putt selections. Each shot goes straight from the starting to finishing square. Only one combination will get you in the hole and you may never land o the grid, in a tree or in a bunker.

Complete the grid so that every row and column, and every outlined area, contains the letters A to G.

Which two of these block piles could be tted neatly together to make a perfect 3 x 3 x 3 cube?

For every tree you must mark a tent horizontally or vertically adjacent to it. No tent can be in an adjacent square to another tent (even diagonally) but a tree can border any number of tents. The numbers by each row and column tell you how many tents there should be in that row or column. Can you locate all the tents?

Challenge both your logic abilities

and your visual perception at the same time using

“Quipus”.

Weekly puzzle problems devised David J. Bodycombe, Games consultant and puzzle writer; currently Question Editor for BBC4's Only Connect and author of Penguin Sudoku books.

Train your brain with BrainSnacks®!

Every day we treat you to a new, unique visual brainteaser that will set your brain to work for a few minutes. Compare your personal score with the world score; you’ll know right away whether your brain is in top form.

Draw a line around the grid that passes through ALL the black and white dots before joining up with itself to make a continuous loop. Your line can pass through or turn left or right in empty squares, but there are rules for squares containing dots. Your line cannot cross over itself, branch off, or go through the same square twice.

Each of the characters in this sum box represents a different number, with the sum of all the numbers at the end of each row and column. Can you work out which number is each character represents and fill in the question mark?

Each colour represents a direction (up, down, left or right) and the number of dots on each die tell you how far to go. Starting in the middle die of the maze, follow the directions correctly and you will visit every die in turn once only. Which dice is the last you visit on your trip?

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

Can you work out which areas of this diagram represent striped fresh water flat fish that don’t have dorsal fins, and salt water flat fish that have dorsal fins but not stripes?

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The numbers on the side and bottom of the grid indicate occupied squares or groups of consecutive occupied squares in each row or column. Can you finish the grid so that it contains three Trawlers, three Tugs and three Buoys so that the numbers tally?

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

The twenty steps that make up this dance end with the

Red Step. Can you trace back the sequence from there and

work out which was the very first step in the dance?

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Can you place a queen, a bishop, a knight and a rook on this chessboard that the red squares are attacked by exactly two pieces, the green ones by 3 pieces and the yellow ones by 4 pieces?

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This cut-out shape can be folded to make a cube.

Which of the four cubes below is the only one it could make?

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Which two of these block piles could be fitted neatly together to make a perfect 3 x 3 x 3 cube?

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This used to be a big cube made of 125 small blocks measuring 5 by 5 by 5. If all the blocks that are not visible from this angle are present, can you work out how many have been taken away?

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

Complete the six equations, three across and three downwards, by fitting all the digits from 1 to 9 into the empty green squares.

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This week’s big Lotto numbers are in. The five winning balls are all even numbers, none of them are green and none of them contains the number 3 or is divisible by 4. Can you find the fortunate five?

Make your way from A to B without passing through any blue squares - Then come back without passing through any green squares!

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

Each of the four different coloured spots on the cube represents a direction - Up, Down, Left or Right. Can you work out which colour represents which direction and make your way from a to b?

The blue arrow tells you which way is up...

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Each number in the grid indicates the exact number of black squares that should share borders with it. Shade the empty squares until all the numbers are surrounded by the correct number of black squares. Don’t shade any numbered squares, and there is only one solution.

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Complete the Number Square so that the numbers 1 to 25 are all in the grid, and all rows and columns add up to the totals indicated to the right and below.

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You have four shots in which to get your golf ball upwards from the tee to the hole. Choose one each from the Drive, Iron, Chip and Putt selections. Each shot goes straight from the starting to finishing square. Only one combination will get you in the hole and you may never land off the grid, in a tree or in a bunker.

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

These patchwork is in three colours - blue, purple and red. If we don’t want any same-coloured pieces to share a border, what colour will the pieces at a and b be?

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To open the safe, all 20 of the buttons must be pressed in the correct order (which is indicated by the numbers and directions on the buttons) before the “open” button is pressed. What is the ﬁrst button pressed in your sequence?

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

Each of the five different coloured balls represents a different weight - 1, 2, 3, 4 or 5 kilos. Can you work out which balls weighs what, and how many yellow balls will balance the final scale?

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Divide the Shikaku grid into rectangles. Each rectangle must contain a single number, and that number must describe exactly how many boxes there are in the rectangle.

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

Complete the grid so that each row and column contains a red, orange and green light. The lights at the end of each column and row tell you the colour of the first light you will meet if you travel in that direction down the column or row.

©Guy Campbell. Dist. Knight Features. All Rights Reserved.

From the given clues, in no particular order, find the five 5-letter answers. Fit each answer into one of the rows of dots, so that every same-coloured dot contains the same letter. What's the seven letter word?

Clues: Light beer. Firearm. Queenly.

Look daggers. Substantial

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