Questions tagged [sequence]

A puzzle about sequences of symbols, elements, or other objects.

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84
votes
7answers
17k views

Thanks, dad! Never again

No idea why my dad dragged me into this place. Some guy is performing on the stage. He's reading numbers out loud. I think it's some kind of a sequence puzzle. 1... 8... 9... 16... 17... ...
33
votes
1answer
3k views

The mystery flag

Part two - The mystery flag - twisted Based on these flags: (Count the sun in the Argentina flag as yellow) Which country does this flag belong to? Please explain why EDIT: I added a black ...
32
votes
3answers
2k views

Should You Take the Pill?

An entry in Fortnightly Topic Challenge #50: Escape Rooms Your head is throbbing like mad. You try to get your bearings as you look around the laboratory. Shattered beakers and spilled chemicals are ...
28
votes
12answers
2k views

Shapes and letters. What is the missing box?

Finally, someone has figured it out. Good job.
24
votes
1answer
1k views

A predictable sequence

"Four, four, four, ..." droned the random number generating monster. "Are you sure that's random?" I asked. "That's the problem with randomness, you can never be sure!" ...
22
votes
5answers
2k views

There are fifteen triangles, what is the sixteenth?

This is "fifteen triangles": ▲ ▼ ▲ ▲ ▼ ▼ ▲ ▲ ▲ ▼ ▼ ▲ ▲ ▲ ▼ ? Each triangle points up or down. What the "?" figure should be and why?
22
votes
1answer
416 views

Sergeant Sequence takes the case

It was 2am and Sergeant Sequence had been called in to Headquarters urgently. The second he stepped through the door a file was pressed into his hands by the Chief Investigator, who began to talk ...
21
votes
1answer
1k views

A Sequence That Keeps Changing?

So I get this special sequence of "items" as the following: 2 1 3 4 7 8 2 5 2 3 9 But look! If I put some numbers (randomly) in front of the sequence: 3 4 2 1 3 4 7 8 2 5 2 3 8 And yeah! ...
18
votes
1answer
551 views

Chain Puzzle: Tabletop Games #01 - Let's Play

This is the first Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or ...
18
votes
3answers
653 views

Basically Binary but Boldly Baffling

Another image sequence puzzle inspired by @Conifers, enjoy ;D Colorblind-friendly version Clarification: one or more tag(s) has been deliberately omitted to enhance the difficulty. Hints 1 2a 2b ...
17
votes
1answer
1k views

A week around Europe

I've recently returned from a week of travelling around Europe, visiting a different town or city in a different country on each day, choosing my destinations according to an underlying pattern. I've ...
17
votes
2answers
759 views

16 number puzzles on a blackboard

I have left you some number puzzles on the blackboard. Solve them and let me know what they spell. Hint:
16
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2answers
2k views

What is the next number in the series?

What is the next number of this series? 1 , 4 , 5 , 6 , 7 , 9 , 11 ?
16
votes
1answer
616 views

You can count on Sergeant Sequence

"Ah, Sequence, there you are," said the Chief Investigator as Sergeant Sequence entered the briefing room. "Your man Patrick Terne is on the move again, and we need your help to track ...
15
votes
1answer
435 views

Spot the pattern. There is none

Look at these pictures: What's the next picture? As requested, bellow is a set of possible answers. You don't have to look at them to find the correct answer.
15
votes
1answer
347 views

Chess A Knight's Journey

You'll need to know about: A game that has existed for over 1500 years A game that doesn't exist ♞ → I → II → III → ... Answer = Xxxxxxxxx
14
votes
2answers
2k views

Modification of 100 lightbulbs problem (everyone flips 100 bulbs each)

This is a modification to the usual 100 lightbulbs in a room puzzle. Like before, the first person flips the switch of every lightbulb. However, while the second person also starts from the first ...
14
votes
7answers
7k views

IQ-test-type question - sequence of large triangles with black and white small triangles in them

This puzzle is said to be from a Russian test and has an obvious but not fully fitting answer: The task is to find correct picture to replace question mark. The "obvious" pattern is But of ...
14
votes
1answer
1k views

A Harry Potter sequence puzzle

What is the next term in the following sequence based on Harry Potter? None, 16, None, 16, 5, 9, ?
14
votes
2answers
379 views

It comes full circle

Top, Middle, Bottom, Double-Right; Double-Right; Up Left, Middle, Double-Right; Double-Right; Top, Middle, Bottom, Up Left, Down Right; Top, Middle, Bottom, Up Left, Double-Right; ??? What would ...
14
votes
1answer
483 views

A fortified nonogram

This puzzle is part 21 of Gladys' journey across the globe. Each part can be solved independently. Nevertheless, if you are new to the series, feel free to start at the beginning: Introducing Gladys. ...
14
votes
1answer
686 views

This puzzle is a loss

What should replace the question mark on this list? JBNRS, HF, GM, JPD, VL, AELMP, MS, WB, CB, GS, EC, SV, PD, PEJP, ?, … Hint, added later: Hint, added even later:
13
votes
1answer
723 views

We Need to Extract Frank’s Site Rankings

I asked my friend Frank to rank his favorite Stack Exchange sites from 1 (favorite) to 10 (least favorite). This is the feedback he left, but I got them a little mixed up and don’t know which he ...
13
votes
2answers
624 views
+50

You don't want to sell me matchsticks

Fix the image before completing the sequence. What do I want you to draw your attention to? 103, 91, 79, 0, x, x, 28, x, x, x, 0, 78, x, x, x, x, x, x, 5 Hints:
13
votes
1answer
404 views

A simple twist on a classic puzzle

Given this sequence: 0, 4, 84, 212, 1940, 358036, 14113428, 127377044 What is the next item? Hint: Hint:
12
votes
1answer
335 views

Circling the rectangle: A strange IQ problem

I'm sure you're all familiar with pattern recognition puzzles where you have to find the next picture in a sequence. Well, I’m completely stumped on this one… Can you help? There is a sequence of ...
11
votes
1answer
2k views

I bet you can't find the next number in this sequence

Find the next number in this sequence. 9, 72, 16, 83, 33, 33, 36, 37, 32, 65, ?
11
votes
2answers
1k views

What's next? Think laterally

What is next in this sequence? V I V I I I V I I I I I V V I I V I V I I I I V ? Answer is one of the following three options A: I I I V I V I I V B: I I I V I I I I I I V C: V I I I V Hint Not a ...
11
votes
1answer
1k views

Can you help James Bond find the next letter?

James Bond needs to hack into Le Chiffre's computer to prevent him from fulfilling his evil plan. All he needs to do is find the next letter in this sequence: H O T T S F F F S Question: Can you ...
11
votes
2answers
283 views

Finger sequence – find the continuation

Pick the correct continuation for the sequence. Options: Hint:
11
votes
1answer
264 views

A sequence of three letter words/abbreviations

I have ten three letter words/abbreviations in a sequence, numbered 0-9, each of which differ by precisely one letter from their previous and next words. Here are clues for each of the words: The ...
10
votes
6answers
448 views

I shouldn't have asked him.. again

My roommate (rm) always looks busy in front of his laptop, so I try to start talking to him Me: Hi, the last time we talked you told me your favorite book, and I like your taste! it's a very good ...
10
votes
1answer
1k views

The end of the life!

$1\ 16 \ 41 \ 55 \ 79 \ 90 \ 103 \ 120 \ 123 \ ?$ What is the last number in this different sequence! If you find it, it will be the end of the life!
10
votes
2answers
351 views

Wordsmiths & Wyverns

You awaken in a foul crypt with only the following items at your disposal... ROPE, BOOTS, AMULET, MAP, FLAIL, CHAIN, CUP, BELL, STAFF, RING, CODEC, RUM, FLUTE You also have the following tools. Awl (...
10
votes
1answer
228 views

What's the order?

Below are five sequences of the digits 0-9 but each have been sorted based on a single criterion. 1) $1260459378$ 2) $1742350698$ 3) $0152469378$ 4) $5463728190$ 5) $1235904687$ Name the ...
10
votes
2answers
416 views

12 more blackboard puzzles (letter puzzles)

I have previously posted number puzzles. This time it's letter puzzles. Some clues have a Harry Potter theme. Hint: Hint 2: Hint 3:
10
votes
1answer
944 views

Find the element that does not fit the pattern

These 12 elements form a set with a certain pattern, but there is one element that does not fit. Which one is that? HINT HINT 2
9
votes
2answers
265 views

A Pixelated Sequence - Find the Continuation

A late question inspired by Finger sequence – find the continuation How should the grid above the '10' be coloured?
9
votes
1answer
221 views

A new charity hit single

There's a new charity hit single coming soon! 59 musical artists from the worlds of rap, hip-hop, pop, rock, musical theatre and country music have been working on a unique collaboration, performing a ...
9
votes
1answer
1k views

Finding the missing Symbols

_ # – _ _ # # – ? _ # – _ _ # # – = # _ # – _ _ # # – ? _ # – _ _ # # – = # _ # – _ _ # # – ? _ # – _ _ # # – _ # – _ _ # # – ? _ # – _ _ # # – = # Which two ...
9
votes
2answers
286 views

How is BABBAB formed

$[A ...] \to A [...]$ $[B ...] \to B [S [...]]$ $[S A ...] \to B ...$ $[S B ...] \to A [S ...]$ $[S] \to B$ $[ ] \to$ (E.g. $[AAB] \to AABB$) But, $[????] \to BABBAB$ Bonus puzzle:
9
votes
1answer
433 views

Missing element of the sequence

Could you find the missing symbol in the sequence shown below? Hope you like :-)
8
votes
1answer
775 views

A sequence about you (Puzzling Stack Exchange users)

I have a mysterious sequence for you... $204, 186, 172, 133, 126, 123, 120, 119, 111, 107, 102, 96, 90, 87, 86, 86, 85, 79, 75, 73, 70, 68, 66, 66, 65, 65, 65, 64, 64, 64, ...$ This sequence may ...
8
votes
4answers
1k views

Nine, Seven, Gibberish, then what?

Here's a sequence: What is the next item? Here are possible answers (but you don't need to look at them to figure it out): Update
8
votes
6answers
4k views

20 cards facing down

You have a row of $20$ cards facing down. A 'move' consists of the following actions performed in sequence: Pick a face-down card and flip it face-up If there is one, also flip the next card on ...
8
votes
1answer
337 views

Who started it? And who did not?

The question is: Who started it? And who did not?
8
votes
4answers
1k views

Find the missing number in this transformation

I've recently come across this puzzle. 2,5,8 = 122348 3,5,4 = 181224 7,4,6 = 352230 5,3,10 = 203340 3,9,4 = ? I was able to figure out 30**40 but couldn't proceed ...
7
votes
1answer
409 views

Planet of Animals

Source: Planet of the Apes, 2001 In a world not too different from our own, the roles of men and animals are reversed. It is animals who have dominion over men, and men who submit to animals. In the ...
7
votes
1answer
182 views

What will be next at the bottom row and why?

There is a stack made of 6 squares. As you can see there are yellow squares between red ones. The question is what will be the next row like? And why?
7
votes
2answers
352 views

That letter sequence started so nicely

Find out how the following letter-sequence is constructed: ...