Challenging Puzzle

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Set the first switch on for about 10min, and then switch on the second switch and then enter the room.

Three cases are possible

1. Bulb is on => second switch is the answer

2. Bulb is off and on touching the bulb, you will find a bulb to be warm

=>1st switch is the answer.

3. Bulb is off and on touching the second bulb, you will find a bulb to be normal(not warm)

=>3rd bulb is the answer.

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Amazing Facts

No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki