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Puzzles and riddles

I have a certain interest in puzzles and riddles. For this reason, it is not strange that it is on of these reoccuring subject in my online diary.

Socks riddle

People standing in a circle

Filling the 70x70 square with 1x1 to 23x23

Squares on a grid

Goat problem

Usage Sort

Morse reordering puzzle

Squares inside squares and rectangles

Folding strips of paper

A wooden puzzle


(proven to be NP-complete for sufficient colors and size.)

Making a CD label

Optimization problem

Triangle tilings

Square tilings



Rule 30

See also:

Exact Cover


Chinese Wooden Puzzle

Racing horse game


Arabic Geometric Patterns

Latest PostScript file.

P versus NP problem

Infinite grid coverings


Extremely Loud & Incredibly Close

Jugo Flower

Diagonal mazes

Six of six colours on six by six squares

Four colour theorem



Street Tiling Patterns

Fractal Jigsaw

Irregular Chocolate Bar

HEMA puzzle

Colour rubber straps


Sum of squares

KABK wrapping paper

Round Goki puzzle

Irregular grids of squares and equilateral triangles

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