Gerard's Universal Polyomino Solver -  .

Animal enumerations - - Enumeration on regular tilings of the Euclidean and Hyperbolic planes.

Anna's Pentomino Page - - Anna Gardberg makes pentominoes out of sculpey and agate.

Arnab's Pentominos Puzzle - - Fast Pentominos puzzle solver, works on DOS/Windows platform. Free downloads.

Blocking polyominos - - Rodolfo Kurchan asks, for each k, what is the smallest polyomino such that k copies can form a blocked pattern. With solutions.

Canonical polygons - - Ronald Kyrmse investigates grid polygons in which all side lengths are one or sqrt(2).

Christopher Monckton's Eternity Puzzle - - 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.

Counting Horizontally Convex Polyominoes - - Journal of Integer Sequences, Vol. 2 (1999), Article 99.1.8. Defines and counts horizontal convexity.

Cynthia Lanius' Lesson: Polyominoes Introduction - - From tetris to hexominoes, Cynthia explains them in color.

Dancing links - - Don Knuth discusses implementation details of polyomino search algorithms.

A dissection puzzle - - T. Sillke asks for dissections of two heptominoes into squares.

Eithan's Pentominoes-3D Applet Solver - - Solves given Pentominoes 3D puzzles. Solution is displayed in 3-D with disassembly and rotations. General information and data. [requires Java.

Equilateral pentagons - - Jorge Luis Mireles Jasso investigates these polygons and dissects various polyominos into them. Animations show cases of infinite solutions.

Eternity Page - - Alex Selby's page with a description of his solution method, with illustrations in .png and .pdf files.

Flexagons - - Folded paper polyiamonds which can be unfolded to show hidden faces. Make interesting school projects.

Flexagons - - Conrad and Hartline's 1962 article on Flexagons.

Gamepuzzles - - Polyomino and polyform games and puzzles manufactured by Kadon Enterprises Inc.

The Geometry Junkyard: Polyominoes - - Numerous links, sorted alphabetically.

George Huttlin's Puzzle Page - - George Huttlin shares some ramblings in the world of polyominoes.

Gerard's Pentomino Page - - Illustrates the 12 shapes. symmetrical combinations.

Golygons - - Harry J. Smith's explains polyominoes with consecutive integer side lengths.

Golygons by Mathworld - - What they are, and how to find them.

Harold McIntosh's flexagon papers - - Including copies of the original 1962 Conrad-Hartline papers. Abstract, html-pages, or .pdf documents.

Henri Picciotto's Geometric Puzzles in the Classroom - - Polyform puzzle lessons for math educators to use with their students, including polyominoes, supertangrams, and polyarcs.

Hepto - - Some packings of the 108 heptominoes (with unit thickness) into various blocks.

hexiamonds - - George Huttlin explains and illustrates these shapes composed of 6 equilateral triangles, which in turn tiles different forms.

Information on Pentomino Puzzles - - At the Combinatorial Object Server.

Isoperimetric polygons - - Livio Zucca tiles polygons of equal perimeter, or isoperiploes.

Java pentominoes - - Thery families web site with pentomino solver. (English/French)[Java].

Knight's Move Tessellations - - Dan Thomasson looks at tesselations with numerous unexpected shapes traced out by knight moves.

Lego Pentominos - - Eric Harshbarger. This puzzle maker says that the hard part was finding legos in enough different colors.

Logical Art and the Art of Logic - - Pentomino pictures, software and other resources by Guenter Albrecht-Buehler.

The Mathematics of Polyominoes - - Kevin Gong's home page includes articles, programs for Mac, Win and Java.

The mathematics of polyominoes - - Kevin Gong offers download of his polyominoes games shareware for Windows and Mac. 100 boards are included. A Java version is in the works.

Mathforum : a pentomino problem - - from the Geometry Forum. Lists the pentominoes; fold them to form a cube; play a pentomino game. (project of the month, 1995.

Mathforum : minimal domino tiling - - Tiling a square without cutting it into two.(Problem of the week 826, Spring 1997.

Mathforum : Tiling rectangles from ell - - Stan Wagon asks which rectangles can be tiled with an ell-tromino.

Maximum convex hulls of connected systems of segments and of polyominoes - - 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..

Miroslav Vicher's Puzzles Pages - - Polyforms (polyominoes, and polyiamonds) graphics, tables and resources (English/Czech).

my polyomino page - - Michael Reid's numerous articles on polyominoes and tilnig, with references and links.

Packing Ferrers Shapes - - Alon, Bóna, and Spencer show that one can't cover very much of an n by p(n) rectangle with staircase polyominoes (where p(n) is the number of these shapes).

Packing Polyominoes - - Erich Friedman's Introduction to a variety of packing and tiling problems.

Packing polyominoes - - Mark Michell investigates packing pentominoes into rectangles of various non-integer aspect ratios in order to obtain the largest possible pieces using straight cuts.

Pentamini pentaminos pentominoes - - A container of mathematical games, gadgets and software. (English/Italian.

Pento-Mania - - Pentomino based puzzle game lets children solve and create geometric puzzles. Win32 software, try or buy.

Pentomino Applet - - Rujith de Silva's applet puzzle offers games of four different sized rectangles. [Java.

Pentomino applet - - Fill up a given area using pentomino shapes, rotating and flipping them. Three levels of difficulty.[Java].

Pentomino Covers - - Problems on minimal covers.

Pentomino dissection of a square annulus - - From Scott Kim's Inversions Gallery.

Pentomino, Homepage - - Lorente Philippe's site describes the building blocks, nomenclature, solutions, and numerous games. (French/English.

Pentomino Relationships - - Symmetries in the families of rectangular solutions.

The Pentomino-Dictionary by Gilles Esposito-Farèse - - English words that can be written using the pentomino name letters FILNPTUVWXYZ and other related curiosities, including a homage to Georges Perec. (English/French).

Pentominoes - - Expository paper by R. Bhat and A. Fletcher. Covers pre-Golomb discoveries. the triplication problem and other aspects.

Pentominoes - an introduction - - Centre for Innovation in Mathematics Teaching presents colourful examples of many tiling problems, duplication, triplication, etc.

A Pentominoes Project from Belgium - - Secondary School project about pentominoes and fun with math. History, descriptions, and problems. Bi-monthly pentomino competition. A solver is available. [English, French, Dutch.

Pentominos - - B. Berchtold's applet helps tile a 6x10 rectangle. [German.

Pentominos - - Graphics problems, solutions (including animated GIF) and links. (English/German through main page.

Pentominos Puzzle Solver - - David Eck's graphical solver applet uses recursive technique. Source code available. [Java.

The Poly Pages - - About various polyforms - polyominoes, polyiamonds, polycubes, and polyhexes.

Polyform and dissection puzzle links - - Christian Eggermont's link page.

Polyform spirals - - Jorge Luis Mireles explains finite and infinite spirals made up of polyforms.

Polyforms - - . Ed Pegg Jr.'s site has pages on tiling, packing, and related problems involving polyominos, polyiamonds, polyspheres, and related shapes.

Polygon Puzzle - - Open source polyomino and polyform placement solitaire game.

Polyiamond exclusion - - 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.

Polyiamonds - - Mathforum. This Geometry problem of the week asks whether a six-point star can be dissected to form eight distinct hexiamonds.

Polyomino and Polyhex Tiling - - Joseph Myer's tables of polyominoes and of polyomino tilings, in Postscript format.

Polyomino applet - - Wil Laan's applet searches for solution of packing hexominoes into more than 45 different shapes.[Java.

Polyomino enumeration - - 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.

Polyomino Fuzion game - - Puzzles using pentominoes and hexominoes. Fuzion, game that designs and (semi-)automatically finds solutions. Links.

Polyomino tiling - - . Joseph Myers classifies the n-ominoes up to n=15 according to how symmetrically they can tile the plane.

Polyominoes - - Describes a numerical invariant that can be used to classify polyominoes.

Polyominoes - - Introduction to Tetrominoes, Pentominoes, Hexominoes, Heptominoes, Octominoes, Fixed (translation only) Polyominoes. Numerous Links.

Polyominoes: Theme and Variations - - A brief essay with some references.

Polypolygon tilings - - S. Dutch discusses polyominoes, poliamonds, and polypolygons with special attention to tiling characteristics.

A Puzzle by Enrich Friedman - - Every square can be dissected into L-ominoes. Can every Pythagorean square? Conjecture needs proof.

Puzzle Fun - - Newsletter edited by Rodolfo Kurchan about pentominoes and other math problems.

R&A Media, Inc. - - Manufactures wooden puzzles of polyomino type. Includes Prices, tips, hints and pages with solution counts.

Random domino tiling of an Aztec diamond - - Matthew Blum demonstrates the properties of random domino tiling of an Aztec diamond. Interactive graphics display.

Rectifiable polyomino - - Karl Dahlke explains and demonstrates tiling. Includes C-program source.

Schröder Triangles, Paths, and Parallelogram Polyominoes - - A paper on their enumeration by Elisa Pergola and Robert A. Sulanke.

Six squares problem - - This Geometry Forum problem of the week asks for the number of different hexominoes, and for how many of them can be folded into a cube.

Solomon W. Golomb - - Home Page of the inventor of polyominoes. Includes biography, black and white picture, research interests and publications list.

The Soma Cube - - Soma-solving program in QBASIC by Courtney McFarren.

Soma cube applet - - Mehta & Ward Alberg explains the soma cube and provides an applet for practice. Source codes included. [Java.

Somatic - - A solver for arbitrary polyomino and polycube puzzles. Binary code and source downloads available.

sqfig and sqtile - - Eric Laroche presents computer programs for generating polyominoes and polyomino tilings. Includes source codes in C, and binaries.

square into similar triangles - - T.Sillke discusses the dissection problem.

Taniguchi's Programs - - Windows software to solve polyiamond and sliding block puzzles.

Tesselating locking polyominos - - Bob Newman examines the history of the subject and presents his minimal solutions.

Thorleif's SOMA Page - - SOMA puzzle site with graphics, newsletter and software.

The three dimensional polyominoes of minimal area - - 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).

Three nice pentomino coloring problems - - Alexandre Owen Muñiz presents the Icehouse set which lends itself to different polyomino coloring games.

Tiling and Packing Results of Torsten Sillke - - Polyominoes, polycubes and polyspheres.

Tiling of Pythagorean triplets - - Joe Fields suggests that L-decomposition of squares of Pythagorean triplets could always be tiled.

Tiling UROP Homepage - - Undergraduate Research Project in Random Tilings.

Unbalanced anisohedral tiling - - 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.

Unbeatable Tetris - - Java applet demonstres that this tetromino-packing game is a forced win for the side dealing the tetrominoes. Complete with mathematical proof. [Java.

Unfolding the tesseract - - 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.

What is a Golygon? - - Harry Smith describes Dr. Dewdney's article in the July 1990 Scientific American's Mathematical Recreations column.

Xominoes - - Livio Zucca finds a set of markings for the edges of a square that lead to exactly 100 possible tiles, and asks how to fit them into a 10x10 grid.