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.

Read More# Logic Puzzles

# 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.

Read More# Enigmatico

Get your brain cells in a spin with these challenging logic puzzles!

Read More# REDacted

Use logic to reveal what hides behind the red tape

Read More# 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?

Read More# Logic Gates

Puzzles involving boolean circuits and electronic logic gates.

Read More# 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?

Read More# 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?

Read More# 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.

Read More# 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?

Read More# Psycho Games

Synaptic Puzzles to enhance mental flexibility.

Read More# 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.

Read More# Knot Puzzles

Entertaining and perplexing rope puzzles.

Read More# Matchstick Puzzles

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/

# Par Four

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.

Read More# Latin Square

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

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