Magnetizer

The magnetizer is often reffered to as the most useful item in the game. It can be used to repolarize tokens like magnets, monopole magnets and lasers, it can be used to push around items which is especially useful when it comes to gels, it can also be used to prime the catapult.

Trivia
In ChessAdventures classic the magnetizers only function was to rotate magnets in the editor. Later it was discovered that it could be useful as an actual level element, and with time more functions was added to it (like pushing around items).