Shape!

http://www.primaryresources.co.uk/online/longshape3d.html

http://www.crickweb.co.uk/assets/resources/quad.swf

http://www.interactivestuff.org/match/maker.phtml?featured=1&id=14

http://www.interactivestuff.org/match/maker.phtml?featured=1&id=32

http://mathematics.hellam.net/boring.html