click to add or remove lights. The aim is to light up the whole area using the minimum number of lights. The glass (darker grey with diagonal lines) needs to be lit but you can not place a light on it. The candle does not need to have a light shining on it. The Vampire (Black square with a smiley face) cannot have a light shining on it.
Congratulations to scratchboybob and samgameplex for managing to solve level 23 with one fewer light than I thought was possible! Also congratulations to CatsAre2Cute for solving level 17 with 1 fewer light than I thought possible (Not I think it's a much more difficult level since this took a while for anyone to see)