To solve these puzzles, you have to form a complete closed circuit from dot to dot (or number). The path must make a right angle at each number, and the number indicates the total length of the two straight path sections which meet at that point. The circuit must not cross over itself.
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Above an example You can start connecting the dots in the applet opposite. Draw the lines using the mouse. The applet cannot tell if you're right or wrong. You can undo your previous moves, one by one... |
Below are example grids for those who can't load the Java-Applet.

Solution (not for the tenacious)
Puzzle Index