There was a cool computer game called the Zoombinis that we used to play at home. One of the puzzles taught binary arithmetic using strange characters that had

There was a cool computer game called the Zoombinis that we used to play at home. One of the puzzles taught binary arithmetic using strange characters that had two expressions. There's a picture here: http://www.computingwithkids.com/column/20011026.asp http://www.computingwithkids.com/column/20011026.asp The addition went up to 15 I think. You had to aim the pinballs at the group that would 'overflow' and jump in the river. There were some very challenging puzzles in the Zoombinis titles - but they were teaching the conceptual foundations and encouraging intuition, not focussing on the terminology and modern applications. Edit: a more useful link, with educational context and a larger picture, is this, although it's in French: http://la-rochelle-ecole-barthelemy-profit.pagesperso-orange.fr/Zoombinis2/page3.htm http://la-rochelle-ecole-barthelemy-profit.pagesperso-orange...