@ElTaPa @williamjs I’m here.
I solved this riddle yesterday, and thought it was interesting. I modified a lot of it so it can’t be googled.
Here it is!
There is a magical castle in the sky that houses seventy people. They all have one tiny gem on their foreheads, in between their eyebrows (and you can’t take it off. It’s permanent).
The seventy people on this floating castle DO NOT know the following information inside these brackets:
[Half (35) of them have pink gems, and the other half (also 35) have yellow gems.]
All 70 of them don’t know what color their gems are, either.
A magical train visits the castle every night, and will only take back those who have figured out the color of their gems back to the ground.
No one can talk to each other and ask what color their gem is, and there is no mirror or other reflective means to figure it out.
Only the Grand Master.
Now if you had a pink gem on your forehead, you would see 35 people with yellow gems, and 34 with pink.
BUT for all you know, you could have a purple gem, and the number could be,
34 pink, 35 yellow, and 1 purple.
The Grand Master mentioned before says,
“I see at least one person with a pink gem.”
Who leaves (and what color are their gems), and on which night(s)?
[yes, everyone in the castle is very intelligent and will figure it out as fast as possible]