>>>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.
>
>Yep :) I knew this one from the times, I was a kid...

Have you heard this one?

You have 12 billiard balls.

One of them is either lighter or heavier than the others.

You can weigh the billiard balls 3 times on a balance scale.

You need to find out which ball it is and whether it is heaver or lighter.

Is this possible?