By clicking the dots on the diagram to the right can you show how it can be drawn by going over each line once and only once?

Some of the diagrams it is possible while others it is not.

You can earn a trophy for indicating which diagrams are impossible and by tracing the route that completes the others.

Click on the tabs above to switch between the diagrams then click the 'check' button below when you have finished.

Check Start AgainI am convinced this shape is impossible.

I am convinced this shape is impossible.

I am convinced this shape is impossible.

I am convinced this shape is impossible.

I am convinced this shape is impossible.

I am convinced this shape is impossible.

Feedback

This is a computer version of the classic pencil and paper puzzles in which the objective is to trace the diagram without taking the pencil off the paper and without going over the same line twice.

In this version you are required to click on the dots to show the route of the pencil. The 'Start Again' button is provided to let you erase incorrect attempts.

At least one of the diagrams is impossible to draw in this way. A tick box is provided below the diagrams for you to indicate the impossible diagrams.

When you think you have traced all of the diagrams you can and ticked the tick box of the others you can click on the check button to see if you are right. When you have all six diagrams correct you can collect a Transum Trophy for your efforts.

There is also an activity called Bridge Crossings based on similar principles.

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