A logic puzzle

[[ptx]]

Alright, how about this - everyone leaves on the first night.

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Midnight =

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no...

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colours?

[Tomas_of_Miles]

I am tired but still intrigued by this puzzle. I tried to follow up logic and then I gave up. I think I missed it by one night.

[Vibe]

I am tired but still intrigued by this puzzle. I tried to follow up logic and then I gave up. I think I missed it by one night.

You also missed who leaves, so I think you might be going in the wrong direction anyway

[ThePoopy]

the ferry leaves every night

[Vibe]

the ferry leaves every night

Yes it does. But that's obvious from the instructions

[Stabby_Dave]

100 nights and then they all get on the boat?

Why 100 nights?

[ThePoopy]

http://translationparty.com/#10135265
"Trick question is the logical answer"

[Meow]

Alright, how about this - everyone leaves on the first night.

Midnight = no...colours?

... Any islanders who have figured out the color of their own eyes then leave the island, and the rest stay. Everyone can see everyone else at all times and keeps a count of the number of people they see with each eye color (excluding themselves) ...

So your solution only works if you ignore that they actually have to figure out their own eye color to leave and that everyone can see everyone else's eye color at all times.


I would agree though that they will all leave during the first night since: "They are all perfect logicians -- if a conclusion can be logically deduced, they will do it instantly."

Except if the solution needs some kind of system that takes multiple nights to complete

[Earthdforce]

...wouldn't the ferries windows be reflective? If so, doesn't that mean anyone who walks up to it would see their own eye color? Seems too nitpicky to be the answer though.

[Vibe]

...wouldn't the ferries windows be reflective? If so, doesn't that mean anyone who walks up to it would see their own eye color? Seems too nitpicky to be the answer though.

There are no mirrors or reflecting surfaces

[Tomas]

All the people with Blue eyes leave on the 100th night?

[ThePoopy]

The Guru is allowed to speak once (let's say at noon), on one day in all their endless years on the island. Standing before the islanders, she says the following:

[Teeth]

Ask the ferryman?

Can not get anything logic outta this. Not the night and not the people who leave. Maybe those blue eyes the Guru sees are something cosmic that is only visible on a certain night, but she said that during noon, and I doubt a puzzle would expect people to know something like that.

Are you sure the answer is something logically deductable?

Clue in "Every night at midnight, a ferry stops at the island."

This makes me fear its going to be something really stupid and then I'm going to be pissed.

No guessing own eye colours? If I could count 99 blue eyes and 100 brown eyes I would go for blue.

[Vibe]

Ask the ferryman?

Can not get anything logic outta this. Not the night and not the people who leave. Maybe those blue eyes the Guru sees are something cosmic that is only visible on a certain night, but she said that during noon, and I doubt a puzzle would expect people to know something like that.

Are you sure the answer is something logically deductable? This makes me fear its going to be something really stupid and then I'm going to be pissed.

No guessing own eye colours? If I could count 99 blue eyes and 100 brown eyes I would go for blue.

That's guessing.

That "clue" was just to show that that helps you solve how many days. It's not that helpful.

All the people with Blue eyes leave on the 100th night?

Bravo Tomas

Did you come by this yourself or did you have help? Or was it just a lucky guess?
 If you did this by yourself, please share how

[Tomas]

Err - this could get a little convoluted but i'll try and explian my logic - hopefully it is correct and i didn't just get lucky


- Imagine I am a blue eyed person on the Island
- I can see 99 people with blue eyes, 101 with brown eyes and 1 with green eyes
- There are therefore either 99 Blue eyed people or there are 100, depending on my own eye colour.
- Since the Blue eyed people didn't leave on the 99th night, then those 99 people must still not have been sure that they were blue eyed themselves which means I must have been confusuing them
- Therefore on the 100th night, I will know I have blue eyes for certain since there can't be 101 of us, so I will leave along with all the other blue eyed people who realise the same thing at the same time