Ok folks
There is one way to start the map. The 3rd square in the 1st column on the left lights up when you pick up a candle.
Click on that.
Now the spot in the next column will light up, and it is the only way through the barrier. Click your candle on it. Often there is prize in this square, but you are in a barrier row.
Click on the spot in the next column, right next to where you are.
At this point there may be prizes visible in cleared spots. Return the candle to 'home' by clicking again on candles.
Move your mouse to prizes cleared of fogs, and click on them.
Now choose a light source to illuminate your next move, maybe a lantern. This move may illuminate more prizes. And by now you may be able to see what is meant by:
Cleared of fog
Containing a prize
Cleared areas illuminate the squares adjacent to them.
The spots where you can use a light source have a bright patch to guide you.
Best of luck