Gianni, founder of Archimedes' Lab Project™ has written an extensive collection of books in several languages on brain training, critical thinking, visual art, and on the mechanism of vision.

Read more at: https://www.giannisarcone.com/

More Logic Puzzles

Stellargrams

Dive into a Stellargram, where hexagons hold the key to cosmic success! With just six numbers and boundless possibilities, you'll navigate a galaxy of mind-bending challenges.

Movie Quote Hanjie

The numbers at the top and side of this nonogram puzzle indicate squares - or groups of consecutive squares - that are to be shaded in. For example the numbers 5,3 tell you that there is a group of 5 and a group of 3 squares to be shaded, with at least one unshaded square between them.

Once you have identified and shaded all the right squares, the remaining letters will spell out a quote from a famous movie.

Hanjie

The numbers at the top and side of this Hanjie puzzle indicate squares - or groups of consecutive squares - that are to be shaded in. For example the numbers 5,3 tell you that there is a group of 5 and a group of 3 squares to be shaded, with at least one unshaded square between them.

Once you have identified and shaded all the right squares, a picture will emerge.

Shikaku

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.

Masyu

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 o , or go through the same square twice.

Missing Link

So that the grid follows a logical pattern, what exactly should occupy the squares at a, b and c?

Safecracker

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 rst button pressed in your sequence?

See Saw

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?

Grid Lock

There is a pattern behind the placement of the shapes and colours within the grid. Can you identify the pattern, and work out which of the squares below correctly fills the vacant space?

Which Wheel

There are exactly six ways to arrange four colours on a wheel. Which of the wheels: a, b, c, or d, completes the full set of colour combinations?

Sum People

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?

Minesweeper

Each number in the grid indicates the exact number of black squares that should surround it. Shade the empty squares until all the numbers are surrounded by the correct number of black squares.

Patchwork

This 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?

Suguru

Each cell in an outlined block must contain a digit: a two-cell block contains the digits 1 and 2, a three-cell block contains the digits 1, 2 and 3; and so on. No same digit appears in neighbouring cells, not even diagonally.

Cell Blocks/Shikaku

Divide the grid into blocks that are either square or rectangular. Each block must frame a single number, and each block must contain the same number of cells as the number it frames.

Venn Diagram

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?

Logic Gates

Puzzles involving boolean circuits and electronic logic gates.

Cubism

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

Block Party

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?

Binairo

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.

Battleships

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?

Psycho Games

Synaptic Puzzles to enhance mental flexibility.

Bridges

Connect the islands up so that they have the number of bridges shown.

Battery Pack

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.

Baker Street Puzzle Strip

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

Knot Puzzles

Entertaining and perplexing rope puzzles.

Matchstick Puzzles

Baker Street Puzzles

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.

Think Tank

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.

Traffic Lights

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.

Other Puzzles & Games

Crosswords

Puzzle Pages

Word Puzzles

Mazes & Labyrinths

Visual Puzzles

Logic Puzzles

Games

Suduko & Sudoku-Style Puzzles

Number Puzzles

Digital Games & Puzzles

Featured

Content for Children

Puzzles, Games, Activity Pages, Branded Characters and Books for Children

Digital Products

Our digital puzzles are developed in HTML5, CSS and JavaScript and can be viewed across multiple devices (pc, tablet and smart phone) without requiring any plug-ins.

Comics & Cartoons

Some of the best comics and cartoons in the World!

Games & Puzzles

Infographics

Quizzes

Pages & Pull-Outs

Columns & Fillers

We offer a complete lineup of news and feature stories, commentary, photos, graphics from the world's top publishing brands including: Psychology Today • Inc. • Fast Company

Themed Content

News from Knight Features Syndication Department