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Demonstrations 1  20 of 372
Rectangles Reasonably Close to a Given Area
New today
Groops
New this week
Photon World
Pandiagonal Magic Squares of Order Five
Three Crossings Puzzle
Constructing and Solving Nonograms
Cryptic Crosswords
Nonograms from Invaders
Pythagorean Theorem for Regular Polygons
ThreeColor Territory Puzzle
Guess the Antisymmetric Frieze Group, Part 2
Guess the Antisymmetric Frieze Group, Part 1
The Colorit Puzzle
The Diagonal Paradox
Measuring with Two Jugs
Chain Puzzle on Triangular Grid
Wordfinder Puzzle
Volume of a Polyhedron Given by a Particular Net
Crossword Grid Maker
Projections of Cubes and HalfCubes
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