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Coin Cup - Can you turn the cup upside down by moving only two coins?  |  August 11, 2014
The Three Squares - Take twelve matches and arrange them into the grid shown above. Can you move exactly 3 matches and get 3 perfect squares?  |   August 11, 2014
Octagon Castle - Use all the seven pieces to build up the octagon castle. You can rotate pieces and flip them over, but you can not overlap them.  |   August 11, 2014
Fold The Sheet - The object of this puzzle is to fold the rectangle along the lines in such a way that the squares are in serial order from 1 to 8, with number 1 face-up on top. You aren't allowed to tear the rectangle, just fold and possibly slightly bend it.  |  August 11, 2014
The Two Queen Question - Try to place two chess queens on an 8x8 chessboard, first so that they both attack the maximum possible number of vacant cells of the board and second so that they both attack the minimum possible number of vacant cells.  |  August 11, 2014
Sam Loyd Puzzles - There are 25 fantastic puzzles by Sam Loyd on this site - see them all here!  |  August 11, 2014
Two Flowers - Can you put the petals, stems and leaves together to make a circle? You are allowed to rotate the parts but not overlap them.  |  August 11, 2014
The Testa - Can you move the pieces into the grid so that there is exactly one color in every row and column?  |  August 11, 2014
Triangle Folds - Try to fold these rectangles into an equilateral triangle colored fully in red on one side and fully in yellow on the other.  |  August 11, 2014
The Eighth Triangle - There are 7 equilateral triangles...can you move exactly three matchsticks to make a total of 8 equilateral triangles?  |  August 11, 2014
Creating A Cuboid - Which of the following patterns (A through D) can be folded to create a full, 1x1x2 cuboid shown in the middle? Parts of the pattern must not overlap each other.  |  August 11, 2014
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