Puzzles index

Seven bridges of Königsberg


Bridge 1 Bridge 2 Bridge 3 Bridge 4 Bridge 5 Bridge 6 Bridge 7

The city of Königsberg (now Kaliningrad) used to have seven bridges across the river, linking the banks with two islands. The people living in Königsberg had a game where they would try to walk across each bridge once and only once. You can chose where to start. Then click on a bridge to cross it. See if you can manage it!

Bridges left to cross in red:

Starting position:



Click here to see if it is possible but try it yourself first! The explanation is more fun, and makes more sense, after your own attempts.