Lights Around
When clicked, a bulb and its diagonally adjacent bulbs will turn on (if it's off), or turn off (if it's on).
(Note: White circles indicate lighted bulbs.)
For example, in the diagram below, when A is clicked, A and D will turn off.
What is the minimum number of clicks required to switch on all the bulbs in the diagram below?
If you liked this problem, check these out: Lights Out , Lights In , and Lights Row .
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1 solution
Switch on one of the bulb which is off.It will be on and the one diagonal to it will be off. Now both the bulbs which are off will be diagonal to each other which can be switched on in the next click.