TYPE 2 PROHIBITED CELL(S)

Type 2 Prohibited Lamp(s)

The two cells highlighted in blue draw your attention to the pattern cell containing a 3. This cell already has one lamp, so two additional lamps must be placed into the three remaining vacant cells. There is no way of knowing just yet which two cells they will be, but a little thought will convince you that regardless of which two cells contain the lamps, the two highlighted cells will end up being illuminated. Since an illuminated cell may not also contain a lamp, the two highlighted cells must be designated as Prohibited Lamp Cells.