The Sphinx's Lair

Q: See the Line Where the Sky Meets

6:33 AM

Walking along the beach one day, I came across a glass bottle with a piece of parchment inside. I quickly opened the bottle and unfurled the scroll. On it the riddle below was written. i sail eastwards, sleep i concede riches i could earn, musings of nights spent oblivious of need I sm...

riddle knowledge enigmatic-puzzle

1 hour later…

Q: Rearrange these 9 digit - Topological puzzle

7:53 AM

4 3 2 7 1 9 6 5 8 Can you rearrange these 9 digits so that in all of the 8 directions the difference between 1 of the digits and the sum of the remaining 2 shall always be the same? In the example all the columns and rows give the difference 3; (thus 4 + 2 - 3, and I + 9 - 7, and 6 + 5 -...

combinatorial topological

Rand al'Thor

8:22 AM

Is 63! something else than 63+62+61+...+1+0 then? — Gloweye 6 mins ago

Whoops ...

Q: Make 2019 with single digits

8:33 AM

This puzzle is inspired by a puzzle by @Andrew, where the goal is to make 1998 from a minimal amount of 8s. This is a variation of the puzzle, where the goal is to make 2019 using a minimal amount of single digits (0s, 1s, 2s, etc.) More formal description (to remove any disambiguations and loop...

formation-of-numbers

It's easy to mix up the factorial with the summandial or whatever it's called. (In any case, it needs a fancy notation.)

8:49 AM

Well its triangular numbers so I would just call it that

Yes, but that's a bit mundane, isn't it?

True. Although the formula often simplifies upon substitution so its not like it has the same need for a notation like factorial

9:07 AM

It was just meant to be a silly joke, not a serious suggestion.

Q: Boat children and army crossing the river puzzle

During the war, a small detachment found itself confronted by a deep and wide river. However, they found a small boat in which two-children were rowing about. It was a very small boat and can only carry the 2-children, or one grown person with it. How did the captain get himself and his 357 other...

combinatorics topology

Maybe its notation should be ‽ then (interrobang)

Yes, that's appropriately confusing. :)

Q: Why sometimes question did not appear immediately on the site after asking it?

Oh and lets make it better by giving ? to something as well!

Actually this gives me an idea for a puzzle

"This reminds me of a puzzle"

1 hour later…

Puzzling Meta

10:47 AM

I saw, sometimes when I ask a new question it did not appear on the site immediately, it takes sometimes at least 2-3 minutes before appearing but still got a view. I keep on refreshing the filtered list of new questions. does the question is sent to moderator approval first? then it will appear...

support bug

3 hours later…

Q: A short but stimulating robot-control puzzle

1:32 PM

The goal of this puzzle is to find a sequence of max 4 commands that will move the triangle through the maze and visit all colored squares. Three types of commands can be used: F0 makes the sequence start over. The arrows (↑, ↱, ↰) move the triangle (forward) or make it change orientation (c...

pattern visual strategy

Q: Solve this simple Zipper Cipher

2:12 PM

This is a very simple variation on a very simple cipher. I'm sure one of you geniuses on this site will be able to figure it out without any hints (aside from the title). I encourage you to use a computer to solve it, but that is ultimately not necessary. Here you go: Xwj wdwzq sklqgv, bzmjm ...

cipher

2 hours later…

Q: Minimum amount of clues for a 16x16 sudoku

4:32 PM

I know that 17 is the minimum for a 3x3, but what about a 4x4 sudoku?

sudoku

Rand al'Thor

I've voted to reject this suggested edit as attempted vandalism. It's the third(?) such edit I've seen from the same user. Might be worth slapping a suggested-edit ban on them, @Deusovi or whichever mod is around.

Deusovi

thanks for letting me know - I'll take care of it

5 hours later…