50 votes
Accepted

The Dwarves' Test

A dwarf with a red dot will A dwarf with a blue dot will Therefore, on the $N$th day, all dwarves with red dots are present, and all dwarves with blue dots are not.
f'''s user avatar
  • 33.7k
31 votes
Accepted

Ernie and the Pirates of the Caribbean

In order to solve this problem, I used a combination of a flood-fill algorithm and Dijkstra's algorithm. I set up a large grid of cells over the map. Each cell remembers its current distance and its ...
2012rcampion's user avatar
  • 18.9k
28 votes
Accepted

The telltale code

I don't have time to flesh out every detail right now, but the story is clearly Some of the clues that give it away: Some more: In the back-story:
Scott M's user avatar
  • 1,630
23 votes
Accepted

Uncle Mort's Idiots

I would suggest the combination Firstly, the "asking" code combined with the row of numbers suggests that they spelled out a word in ASCII code. The numbers on the front of the safe only go to 100, ...
Zandar's user avatar
  • 3,592
20 votes
Accepted

Given these numbers, find the secret word

Assuming a mistake in the problem layout, we could get something with some significance: The error would be And with this
Keelhaul's user avatar
  • 12.7k
17 votes
Accepted

The Secret Agent Who Got Shot

This one is very literal. Also,
Daphne B's user avatar
  • 3,030
17 votes
Accepted

Reverse hangman #12

I think the answer is: H C P L
Quark's user avatar
  • 6,077
15 votes
Accepted

Ernie and the Superconducting Boxes

First, we need to figure what is the minimum amount of superconductor that we'll lose when making the cut. Optimally, we can cut the large cube net into two smaller cube nets without any waste at all. ...
Bass's user avatar
  • 77.3k
14 votes
Accepted

The box with the curious inscriptions

Them's five volumes and three sections alright. Blurb for the Volumes and Sections: Colophon. This puzzle's apparent construction. Missed clues:   (Would the hints have been necessary in the ...
humn's user avatar
  • 21.9k
14 votes
Accepted

Grandma's Simple Puzzle Box

Few easy steps to solve it:
Jan Ivan's user avatar
  • 5,196
12 votes
Accepted

Ernie and the Uneconomical Flat-breads

Finally, after 5 months of attempting this on and off, I have a solution that meets all of the requirements! I'll go into a bit more depth below, but here's where the cuts are: These pieces can be ...
DqwertyC's user avatar
  • 8,176
11 votes
Accepted

Ernie and the Cake Cutting

This question has 3 very different parts: 1) The equilateral triangle must be cut exactly once such that the length of such cut is minimize and the areas of the two parts are equal. The result is to ...
kaine's user avatar
  • 9,092
11 votes
Accepted

A Story in the Sea Shanty?

I believe @Kate is on the right track, and that the answer is indeed: Specifically: Of course that leaves the last line "unexplained", but presumably that just means:
Alconja's user avatar
  • 37.2k
11 votes

The Secret Agent Who Got Shot

You've already accepted, but this should work as well: As the system could have been
charfellow's user avatar
  • 1,404
11 votes
Accepted

Where am I? A scene of death

This place is Explanation: A scene of death a century ago, and also Ieper elsewhere Il faut regarder plus attentivement.
Gamow's user avatar
  • 45.5k
11 votes
Accepted

An unexpected appearance

user20864's user avatar
  • 1,690
11 votes
Accepted

100 Prisoners' Names in Boxes - Save them all!

Assumption 1: Assumption 2: Assumption 3: Strategy: Results: Costs: Notes on pre-game: Notes on during game:
Arth's user avatar
  • 3,350
10 votes
Accepted

The Key to the Door

My thought process Drawing on that and adding in quite a bit of guesswork: So my answer is
Lio Elbammalf's user avatar
10 votes
Accepted

Is there a way in which all the members can be seated?

Here's a solution which explains the logic... First, you might find it useful to draw up a diagram like this, where every block of 16 letters represents a seat at the table (numbered 1 to 8 for ease ...
Stiv's user avatar
  • 139k
10 votes
Accepted

Ernie and the disappointing drill bits

My job title was Tooling Engineer for a number of years, so I suppose it was fate that kept others from answering this question before I got around to seeing it. Or perhaps lack of CAD software. The ...
Skosh's user avatar
  • 3,808
9 votes
Accepted

Solving Simpletonian Security

JonTheMon's user avatar
  • 9,890
9 votes
Accepted

Is my friend insane?

I'm not all the way there, and this might be way off the mark, but here's my interpretation... Eye morning hair Doctor me police Bee ring hmm eye death aw ree Thay kiss Obviously not correct or ...
academiaTA's user avatar
9 votes
Accepted

Magic Time-travelling Baktun Wheel

How about: and scores: 177 points Source:
Maria Ivanova's user avatar
9 votes
Accepted

Rolling a dice - Expectation Question

How I interpret that condition is that the player has an opportunity to ignore the first result and take a second chance, but they must use the second chance if they do reroll. Possible prize values ...
Apep's user avatar
  • 4,619
9 votes
Accepted

Half and Double Value

I used the following k program to compute it: 2*{~1=#?{x@<x}'$1 2 4*x}(1+)/1 {...}(1+)/1...
ngn's user avatar
  • 479
9 votes
Accepted

Oh boi! Dis aint Engliz! #1

Languages Translated words appear in this order of translation. Words Groups I'm missing the relation, they look like they're all related to
Takeshi's user avatar
  • 825
9 votes
Accepted

Who attempted to betray the Boston King?

I got it, the king thinks the traitor is: But wait, there's more! Having realized this, the conclusion is that:
Amorydai's user avatar
  • 2,963
9 votes
Accepted

Ernie and the Chocolate Bomb

Best solution my computer could find: 7---6 /| /| 4---2 | | | | | | 1-|-3 |/ |/ 5---8 Note that the property that all errors are up to sign the same follows ...
Paul Panzer's user avatar
  • 10.3k
9 votes

Two players alternately name dates

If the first player is the one who says either 2nd January or 1st February, then the winning player is Proof: The first player The strategy is to Note: I assumed that the game only goes over one ...
wimi's user avatar
  • 770
8 votes
Accepted

Ernie and the Revisitation of the Aunts

Sleafar's user avatar
  • 18k

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