Magnets

Can you figure out the rules from this (mostly) solved puzzle?Magnets (850x1024)

 

Here is another solved puzzle,  and here is a description of the rules together with a very easy worked example.

A great way to learn to play Magnets is to use physical pieces, as shown in the photo.

Here are:

If you would like examples of some useful types of logic, here is a step-by-step solution for an easy puzzle and one for a medium puzzle.

Here is a selection of pencil-and-paper puzzles, 30 of each:

And you can always play on-line at Simon Tatham’s Portable Puzzles.