Play abstract strategy board games for free on AbstractBoardGames.com. Explore modern and classic strategy games. Have fun playing with friends or challenging the computer AI.

Cybersecurity challenges for iPhone, iPad, and Mac

The Parable of the Polygons is an explorable, interactive post that uses a simulation of slightly biased shapes (triangles and squares) to demonstrate how small individual preferences can lead to large-scale, unintended social segregation, based on the work of Thomas Schelling.

The Largest Collection of Interactive Geometric Puzzles

120 Levels: From Very Easy to Really Hard, 11 Tutorials, 10 Innovative Tools, Automatic Verification of Solutions, “Explore” Mode and Hints, Dynamic Geometry in Action

Games, visualizations, interactives and other weird stuff.

Use your geography knowledge to figure out the mystery country in as few guesses as possible!

PuzzleZilla is a free online platform offering a large, categorized selection of digital jigsaw puzzles, along with a convenient builder tool that allows users to create custom puzzles from their own images.