12:15 AM
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Arthur and Robert are identical twins. One is a knave and he always lies. The other is a knight and always tells the truth, but you don’t know which one is which. One day you meet one of them and want to find out whether it’s Arthur or Robert. But you can ask only one yes/no question, and the qu...

3 hours later…
2:52 AM
@msh210 i said "for [barber's name]" and she looked up when that person would be available

3 hours later…
5:44 AM
@Jafe Lordy, I've been gone for like... 3 years and Riley riddles are STILL a thing?

4 hours later…
9:24 AM
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This morning when I got up I found a peculiar letter in my mailbox. I think it is probably some local person who has gone on a trip and has decided to tell the whole town about it. However, some parts of it seem garbled, and pretty much the only parts of it written with normal words seem uninform...

3 hours later…
12:05 PM
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Please solve this for me. Thanks

12:45 PM
Tell me if you guys want a hint for the clue. I haven't given one yet because I think the clue is answerable enough. And I think it's because people are enjoying the weekends (validly so), not because the clue is hard, which explains the lack of attempts so far
1:44 PM
@oAlt I assume it's an anagram of "celticprize" containing either OE or a 2-letter abbr. for an old English leader (like ER for Elizabeth), with "like quartz" the definition. But I can't find any such by hand, and haven't yet resorted to Qat.
@Jafe next time try "for the glory of Odin"
0

Can you decrypt this secret message?

2:07 PM
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A new casino has opened up in the town which has only one game. Now, we all know the house has an edge in casino. For this game house has win probability of 60%, and player has win probability of 40%. The cost of each bet is \$1. If player loses, he loses the bet and if the player wins, he gets \... 3 hours later… 4:53 PM @msh210 Good assumptions, but why didn't you find piezoelectric? @MOehm Yup! ah I had looked at electric being in there but I hadn't spent a lot of time or energy pursuing it I searched the Wikipedia page on quartz for Z, which wasn't so smart, because nearly all the hits were on quartz itself. 5:54 PM @MOehm ah, nice @MOehm if only Web browsers allowed regex-based searching There's probably a plug-in for that. (For some serious PSE work I sometimes Ctrl+A, Ctrl+C and Ctrl+V into a text editor. But not today.) yeah, i have a regex plugin for chrome, its pretty helpful @LukasRotter what is it, please? thanks 6:06 PM you can also search wikipedia directly by regex (insource:/.../ intitle:/.../), although it might just not return anything if it takes too long. en.wikipedia.org/wiki/Help:Searching/Regex cool, never knew that 0 This is a generalized version of a TED-ED puzzle. You just wrote a very good puzzle on PSE, getting three upvotes a week. However, the puzzle noob hates your puzzles, and sends you to their dimension of “bad” puzzles. When you reach the dimension, the noob lays down$10 \ge n \ge 100$boxes, with... CCCC: Scratched hike after cryptically doing this (11, 3, 10) 6:31 PM ^ Okay, scratch that. It needs reworking. I'm not sure if there's any more to this other than rot13ing and doing the acrostic on the countries ("drivi a car"). It feels like that's all that's here, but the rot13 decoded text says "keep doing what your doing", implying we need to rot some other starting letters? CCCC: Scratched hike after cryptically doing this pointless thing (11, 3, 10) Next shot. Perhaps not better, but at least legal, I hope. Sorry about that. 6:53 PM maybe scratchedhikeafter* + action = I have no idea 1 hour later… 8:12 PM 2 Here is a visual puzzle I have created. Pick the 2 images that correspond to the question marks below (the order of your choices matter). 8:34 PM 0 An icosahedron has 20 faces which are equilateral triangles. Tom wants to create a very hard mechanical puzzle. With his brand new 3D printer in mind he designs 20 puzzle pieces with identical shapes which in principle nicely fit together to build the icosahedron: The visible face of the assembl... 8:53 PM 0 A simple geometric math puzzle (too simple for MO). Seeing two overlapping square beermats, I had the idea: One mat is the other rotated by an angle. All colored areas are the same (say 1, arbitrary unit). What is the size of the square and the rotation angle? Bonus if you can solve it in your he... 0 Hi I have a puzzle in form of a letter I was looking for someone who’s good with puzzles and enjoy doing them. If there is someone who feels interested send me a DM, I’ll pay a little amount to the person that crack the code for me 9:35 PM @msh210 maybe "for free?" with finger guns 9:56 PM 0 The Sudoku below has difficulty approx 4/10, so it's supposed to be quite simple. However, I'm stomped. Can someone give me some tips here? I'm not looking for the solution, only strategies for how I can solve this as easily as possible. I can of course do a manual brute force by hand, but I'm h... 10:36 PM 0 The Reds, the Grays, the Blues, and the Blacks have a round-robin tournament. Each team plays each other team once, for a total of six games. The Blacks won more games than the Blues. The Grays lost more games than the Blues. The Reds tied the Blacks. (This was the only tie in the tournament.) Wh... 11:16 PM 0 I am placing dominoes on a$16\times 14$grid. Dominoes must be either horizontally or vertically. Each domino must cover$2\$ small squares. What is the minimum number of dominoes that can be placed so that no more dominoes can be placed?