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
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
Get your brain cells in a spin with these challenging logic puzzles!Read More
Use logic to reveal what hides behind the red tapeRead More
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
Puzzles involving boolean circuits and electronic logic gates.Read More
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
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
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
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
Synaptic Puzzles to enhance mental flexibility.Read More