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	Packing Shapes - http://www.stetson.edu/~efriedma/packing.html Erich Friedman's Introduction to a variety of packing and tiling problems.
	Thorleif's SOMA Page - http://www.fam-bundgaard.dk/SOMA/SOMA.HTM SOMA puzzle site with graphics, newsletter and software.
	Gamepuzzles - http://www.gamepuzzles.com/ Polyomino and polyform games and puzzles manufactured by Kadon Enterprises Inc.
	Dancing Links - http://www-cs-faculty.stanford.edu/~knuth/papers/dancing-color.ps.gz Don Knuth discusses implementation details of polyomino search algorithms (compressed PostScript format).
	Hyperbolic Planar Tessellations - http://www.plunk.org/~hatch/HyperbolicTesselations/ Don Hatch's page on hyperbolic tesselations with numerous illustrations.

	Cynthia Lanius' Lesson: Polyominoes Introduction - http://math.rice.edu/~lanius/Lessons/Polys/poly1.html From tetris to hexominoes, Cynthia explains them in color.
	Unbeatable Tetris - http://www.geom.uiuc.edu/java/tetris/ Java applet demonstres that this tetromino-packing game is a forced win for the side dealing the tetrominoes. Complete with mathematical proof. [Java]
	Gerard's Universal Polyomino Solver - http://www.xs4all.nl/~gp/PolyominoSolver/Polyomino.html Computes from 1 to 3.38 billion solutions with graphic display to each of the 60+ problems of different sizes and shapes. Pieces vary from pentominoes to heptominoes, sometimes in combination. Table summarizes properties and example solution of each problem. [Java required].
	Polyomino Enumeration - http://www.mathpages.com/home/kmath039.htm K. S. Brown examines the number of polyominoes up to order 12 for various cases involving rotation or reflections. Equations linking the cases are proposed.
	Polyforms - http://www.mathpuzzle.com/polyom.htm Ed Pegg Jr.'s site has pages on tiling, packing, and related problems involving polyominos, polyiamonds, polyspheres, and related shapes.

	Animal Enumerations - http://www.ieeta.pt/~tos/animals.html Enumeration on regular tilings of the Euclidean and Hyperbolic planes.
	Knight's Move Tessellations - http://www.borderschess.org/KTtess.htm Dan Thomasson looks at tesselations with numerous unexpected shapes traced out by knight moves.
	Christopher Monckton's Eternity Puzzle - http://mathpuzzle.com/eternity.html Rules, the solution by Alex Selby and Oliver Riordan, other resources and links. The puzzle is made up of 209 pieces of polydrafters, each one is a combination of 12-30/60/90 triangles.
	Three Nice Pentomino Coloring Problems - http://xprt.net/~munizao/mathrec/pentcol.html Alexandre Owen Muñiz presents the Icehouse set which lends itself to different polyomino coloring games.
	Counting Horizontally Convex Polyominoes - http://www.cs.uwaterloo.ca/journals/JIS/HICK2/chcp.html Journal of Integer Sequences, Vol. 2 (1999), Article 99.1.8. Defines and counts horizontal convexity.

	Flexagons - http://delta.cs.cinvestav.mx/~mcintosh/comun/flexagon/flexagon.html Conrad and Hartline's 1962 article on Flexagons.
	The Tiling Puzzle Games of OOG - http://www.mcmprod.com/ Mr. Confetti presents a Windows and Java game for tangrams, polyominoes, and polyhexes.
	Polyomino and Polyhex Tiling - http://www.srcf.ucam.org/~jsm28/tiling/ Joseph Myer's tables of polyominoes and of polyomino tilings, in Postscript format.
	Information on Pentomino Puzzles - http://www.theory.csc.uvic.ca/~cos/inf/misc/PentInfo.html At the Combinatorial Object Server.
	Polyominoes: Theme and Variations - http://homepages.cwi.nl/~jankok/etc/Polyomino.html Jankok presents information about filling rectangles, other polygons, boxes, etc., with dominoes, trominoes, tetrominoes, pentominoes, solid pentominoes, hexiamonds, and whatever else people have invented as variations of a theme. References included.

	Pentomino Dissection of a Square Annulus - http://www.scottkim.com/inversions/gallery/golomb.html From Scott Kim's Inversions Gallery.
	The Three Dimensional Polyominoes of Minimal Area - http://www.combinatorics.org/Volume_3/Abstracts/v3i1r27.html L. Alonso and R. Cert's abstract of a paper published in vol. 3 of the Elect. J. Combinatorics. Full paper available in different formats (.pdf, postscript, tex etc).
	Puzzle Fun - http://www.eldar.org/~problemi/pfun/pfun.html Newsletter edited by Rodolfo Kurchan about pentominoes and other math problems.
	Golygons by Mathworld - http://mathworld.wolfram.com/Golygon.html What they are, and how to find them.
	Pentominos Puzzle Solver - http://math.hws.edu/xJava/PentominosSolver/ David Eck's graphical solver applet uses recursive technique. Source code available. [Java]

	Lego Pentominos - http://www.ericharshbarger.org/lego/pentominoes.html Eric Harshbarger. This puzzle maker says that the hard part was finding legos in enough different colors.
	Pentomino Homepage - http://membres.lycos.fr/pentomino/index.html Lorente Philippe's site describes the building blocks, nomenclature, solutions, and numerous games. (French/English)
	Taniguchi's Programs - http://homepage2.nifty.com/yuki-tani/index_e.html Windows software to solve polyiamond and sliding block puzzles.
	Primes of a 14-omino - http://www.math.ucf.edu/~reid/Polyomino/14omino02_rect.html Michael Reid shows that a 3x6 rectangle with a 2x2 bite removed can tile a (much larger) rectangle. It is open whether it can do this using an odd number of copies.
	Sqfig and Sqtile - http://www.lrdev.com/lr/c/sqfig.html Eric Laroche presents computer programs for generating polyominoes and polyomino tilings. Includes source codes in C, and binaries.

	Anna's Pentomino Page - http://www.geom.uiuc.edu/~summer95/gardberg/pent.html Anna Gardberg makes pentominoes out of sculpey and agate.
	Pentominoes : an Introduction - http://www.cimt.plymouth.ac.uk/resources/puzzles/pentoes/pentoint.htm Centre for Innovation in Mathematics Teaching presents colourful examples of many tiling problems, duplication, triplication, etc.
	Polygon Puzzle - http://freshmeat.net/projects/hextk/ Open source polyomino and polyform placement solitaire game.
	Unbalanced Anisohedral Tiling - http://www.angelfire.com/mn3/anisohedral/unbalanced.html Joseph Myers and John Berglund found a polyhex that must be placed in two different ways in a tiling of a plane, such that one placement occurs twice as often as the other.
	Pentomino Covers - http://www.xprt.net/~munizao/polycover/ Problems on minimal covers.

	Pairwise Touching Hypercubes - http://www.stetson.edu/~efriedma/mathmagic/0903.html Erich Friedman's problem of the month asks how to partition the unit cubes of an a*b*c-unit rectangular box into as many connected polycubes as possible with a shared face between every pair of polycubes. Answers provided.
	Gerard's Pentomino Page - http://www.xs4all.nl/~gp/pentomino.html Illustrates the 12 shapes. symmetrical combinations.
	Polypolygon Tilings - http://www.uwgb.edu/dutchs/symmetry/polypoly.htm S. Dutch discusses polyominoes, poliamonds, and polypolygons with special attention to tiling characteristics.
	Unfolding the Tesseract - http://www.apperceptual.com/tesseract.html Peter Turney lists the 261 polycubes that can be folded in four dimensions to form the surface of a hypercube, and provides animations of the unfolding process.
	Polyform and Dissection Puzzle Links - http://web.inter.nl.net/users/C.Eggermont/Links.new/Puzzles/Polyforms.and.dissection/index.noframe.shtml Christian Eggermont's link page.

	Harold McIntosh's Flexagon Papers - http://delta.cs.cinvestav.mx/~mcintosh/oldweb/pflexagon.html Including copies of the original 1962 Conrad-Hartline papers. Abstract, html-pages, or .pdf documents.
	Polyominoes - http://members.tripod.com/~modularity/pol.htm Describes a numerical invariant that can be used to classify polyominoes.
	Pentominos - http://www.mathematische-basteleien.de/pentominos.htm Graphics problems, solutions (including animated GIF) and links. (English/German through main page)
	Polyform Curiosities - http://userpages.monmouth.com/~colonel/polycur.html Topics include exclusion, compatibility, and wallpaper. Includes examples and charts.
	Pentomino Applet - http://www.fwend.com/pentomino.htm Fill up a given area using pentomino shapes, rotating and flipping them. Three levels of difficulty.[Java].

	Tiling of Pythagorean Triplets - http://www2.math.uic.edu/~fields/puzzle/puzzle.html Joe Fields suggests that L-decomposition of squares of Pythagorean triplets could always be tiled.
	Miroslav Vicher's Puzzles Pages - http://www.vicher.cz/puzzle/ Polyforms (polyominoes, and polyiamonds) graphics, tables and resources (English/Czech).
	Tiling Rectangles and Half Strips with Congruent Polyominoes - http://www.math.ucf.edu/~reid/Research/Halfstrip/ Michael Reid's abstract of paper in the "Journal of Combinatorial Theory, Series A".
	My Polyomino Page - http://www.math.ucf.edu/~reid/Polyomino/index.html Michael Reid's numerous articles on polyominoes and tilnig, with references and links.
	Tiling with Notched Cubes - http://www.math.ucf.edu/~reid/Research/Notched/ Robert Hochberg and Michael Reid exhibit an unboxable reptile: a polycube that can tile a larger copy of itself, but can't tile any rectangular block. Abstract of article to "Discrete Mathematics".

	Mathforum : a Pentomino Problem - http://mathforum.org/pom/project2.95.html Geometry Forum: Lists the pentominoes; fold them to form a cube; play a pentomino game. (project of the month, 1995)
	The Mathematics of Polyominoes - http://www.kevingong.com/Polyominoes/ Kevin Gong offers download of his polyominoes games shareware for Windows and Mac. 100 boards are included. A Java version is under development.
	Mathforum : Minimal Domino Tiling - http://mathforum.org/wagon/spring97/p826.html Tiling a square without cutting it into two.(Problem of the week 826, Spring 1997)
	Mathforum : Tiling Rectangles from Ell - http://mathforum.org/wagon/spring98/p856.html Stan Wagon asks which rectangles can be tiled with an ell-tromino.
	Pentominos - http://www.mathematik.ch/anwendungenmath/pento/ B. Berchtold's applet helps tile a 6x10 rectangle. [German]

	Pentomino Applet - http://www.cs.cmu.edu/~desilva/pento/pento.html Rujith de Silva's applet puzzle offers games of four different sized rectangles. Source code available. [Java]
	Blocking Polyominos - http://www.eldar.org/~problemi/pfun/blocked.html Rodolfo Kurchan searches the smallest polyomino such that a particular number of copies can form a blocked pattern. With solutions.
	Pentominoes - http://www.andrews.edu/~calkins/math/pentos.htm Expository paper by R. Bhat and A. Fletcher. Covers pre-Golomb discoveries. the triplication problem and other aspects.
	Pentomino HungarIQa - http://www.pentomino.tvnet.hu/ Kati presents a pentomino puzzle using poly-rhombs instead of poly-squares. [English/French/German/Hungarian]
	Pento-Mania - http://www.virtu-software.com/PentoMania/ Pentomino based puzzle game lets children solve and create geometric puzzles. Win32 software, try or buy.

	Canonical Polygons - http://sti.br.inter.net/rkyrmse/canonic-e.htm Ronald Kyrmse investigates grid polygons in which all side lengths are one or sqrt(2).
	The Pentomino Dictionary by Gilles Esposito-Farèse - http://www.gef.free.fr/pento.html English words that can be written using the pentomino name letters FILNPTUVWXYZ and other related curiosities, including a homage to Georges Perec. (English/French).
	Eternity Page - http://www.archduke.demon.co.uk/eternity/index.html Alex Selby's page with a description of his solution method, with illustrations in .png and .pdf files.
	http://www.moerig.com/somatic/ - http://www.moerig.com/somatic/ A solver for arbitrary polyomino and polycube puzzles. Binary code and source downloads available.
	Pentomino Relationships - http://abasmith.co.uk/pentanomes/pentanomes.html Symmetries in the families of rectangular solutions.

	Polyiamond Exclusion - http://www.monmouth.com/~colonel/xpoly/xpoly.html Colonel Sicherman asks what fraction of the triangles need to be removed from a regular triangular tiling of the plane, in order to make sure that the remaining triangles contain no copy of a given polyiamond.
	The Poly Pages - http://www.recmath.com/PolyPages/ About various polyforms - polyominoes, polyiamonds, polycubes, and polyhexes.
	Pentomino Puzzles. - http://www.exi-online.de/html/eintritt_e.html Pentomino solver with download. Windows 95 and later required. [German/English]
	Tiling a Square With Eight Congruent Polyominoes - http://www.math.ucf.edu/~reid/Research/Eight/ Michael Reid's abstract of a paper in the "Journal of Combinatorial Theory, Series A".
	Rectifiable Polyomino - http://www.eklhad.net/polyomino/ Karl Dahlke explains and demonstrates tiling. Includes C-program source.

	Tiling Stuff - http://www.math.ufl.edu/~squash/tilingstuff.html Jonathan King examines problems of determining whether a given rectangular brick can be tiled by certain smaller bricks. Includes numerous articles in .pdf format.
	The Geometry Junkyard: Polyominoes - http://www.ics.uci.edu/~eppstein/junkyard/polyomino.html Numerous links, sorted alphabetically.
	Henri Picciotto's Geometric Puzzles in the Classroom - http://www.picciotto.org/math-ed/puzzles/ Polyform puzzle lessons for math educators to use with their students, including polyominoes, supertangrams, and polyarcs.
	Schröder Triangles, Paths, and Parallelogram Polyominoes - http://diamond.boisestate.edu/~sulanke/PAPER1/PergolaSulanke/PergolaSulanke.html A paper on their enumeration by Elisa Pergola and Robert A. Sulanke.
	Logical Art and the Art of Logic - http://www.basic.northwestern.edu/g-buehler/pentominoes/ Pentomino pictures, software and other resources by Guenter Albrecht-Buehler.

	Java pentominoes - http://www.thery.free.fr/index.php?option=com_content&task=view&id=18&Itemid=44 Thery families web site with pentomino solver. (English/French)[Java].
	Maximum Convex Hulls of Connected Systems of Segments and of Polyominoes - http://www.maths.soton.ac.uk/EMIS/journals/BAG/vol.35/no.1/b35h1har.abs Bezdek, Brass, and Harborth. Abstract to an article which places bounds on the convex area needed to contain a polyomino. (Contributions to Algebra and Geometry Volume 35 (1994), No. 1, 37-43.)

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