>Very good! The hot lightbulb is the switch you left on long enough to get hot, the lightbulb on is the one you just turned on, and the other lightbulb (the one cool and off) is the one switch you didn't touch.
>
>I have to admit that I never heard of the other two you posted before and haven't got a clue on either! I was leaning towards MAN A on the blue man/red man one but didn't take the time yet to thinnk it all through.
>
>Tracy
>
>>>Nope. Actually this one is much simpler than yours was if you think about it...
>>I think I got it.
>>Turn one switch on and leave it on, long enough for the light bulb to heat up.
>>Turn off that light, and turn on another just before you enter the room.

I used to do these puzzles all the time. I think I've collected about 30 of them over time.