an ideal game for those cold winter nights, based on the principles of good visualization of traditional vertice-edge network diagrams. players can click on the blue dots (vertices), & drag them around. one should then try to arrange the vertices so none of the lines (edges) intersect, so that a new level will appear.
once several levels have been mastered, you can always apply your new skills on the vizster or the enron email networks. []
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Also a good game for not-so-cold summer nights (it's rather addictive). I wonder if graph-node experts who have implemented low-crossings algorithms do better than non-experts?!
In the same vein of soda constructor, which is not really a game, but is equally entertaining none the less:
http://www.sodaplay.com/