The German Königsberg (nowadays the Russian Kaliningrad) had seven bridges and the question was whether you could take a walk that went over all of them without having to double a part of the route. It required the insight of Leonhard Euler—one of history’s greatest mathematicians—to arrive at the negative answer. In the meantime, he solved the problem for every conceivable configuration of roads and bridges and so it can happen that you find yourself in the puzzle game about 250 years later. 1Line hundreds of tasks to choose from, which can all be completed in one line.
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1Line – Find a route along all points
