Questions tagged [mastermind]

This tag is for questions about the board game Mastermind.

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22 votes
3 answers
2k views

Mastermind: Win in two

Bob was very lucky in his last game of Mastermind. Alice was the codemaker; Bob was the codebreaker. They played with six colors and a length four code. Bob's first guess wasn't an immediate win. But ...
  • 1,320
26 votes
12 answers
11k views

What's the optimal strategy for Wordle?

Wordle is a game by Josh Wardle in which you try to guess a 5-letter word in at most six attempts. After each guess, the letters which are not in the word are highlighted in grey, the letters which ...
3 votes
3 answers
195 views

What sequence of letters am I thinking of? (Or: Introducing "Bulls")

1. Warmup "I'm thinking of three letters," I grinned, "in a particular order, and with no repeats." "Are they DRL?" "Well, you guessed one correctly." "Are ...
7 votes
2 answers
1k views

What five letters am I thinking of? (Simplified Jotto.)

1. Warmup "I'm thinking of five letters," I smiled. "Are they ... G, B, K, J, and N?" you asked. "No, none of those." "C, X, Q, A, and N?" I gulped. "Four ...
4 votes
1 answer
254 views

Mastermind: What should I guess next? That depends

Bob was playing a popular adventure game on his computer, and he came across a Mastermind minigame. Here's the results of his first four guesses: Bob has never been great at solving logic puzzles on ...
10 votes
2 answers
763 views

Two dimensional Mastermind

You have probably played the classic game of Mastermind with 4 pegs and 6 colours. It turns out that the codebreaker can always find the pattern in 5 moves or fewer. Now consider the 2D version of the ...
0 votes
5 answers
501 views

Mastermind puzzle: 3548 has 2 correct, one in right place [closed]

Hints: 3548 - 2 correct digits, but only 1 in the right place 4860 - 1 correct digit, but in the wrong place 2356 - 3 correct digits, but only 1 in the right place 2584 - 2 correct digits and in their ...
1 vote
2 answers
216 views

Decode the Code - Solve it

Everything is contained in the image. For any clarification, comment down below.
4 votes
1 answer
323 views

Master Mind Rule ambiguity

A recent question about Programming a Prolog solver for a Master Mind type problem generated a question about a scoring rule ambiguity for Master Mind, which is not solved by the Wikipedia page entry ...
3 votes
2 answers
582 views

5-digit puzzle code looking for solution

Can somebody help me solve this, or can you teach me how? 4 7 2 9 1 - One number is correct but not in right position 9 4 6 8 7 - One number is correct but not in right position 3 1 8 7 2 - Two ...
9 votes
3 answers
2k views

Can somebody answer this 'Crack the code'?

Can somebody answer this? It was given to me as a challenge and I am having doubts in my answer Text version: 2 6 5 7 - Has two correct digits but neither are in the correct place 0 4 1 5 - Has ...
0 votes
1 answer
492 views

Crack the code? Puzzle [closed]

Crack the code . Can you. Then you will be genius.
17 votes
2 answers
2k views

Finish the Mastermind

Mastermind is a well-known game. Here's a brief reminder of the rules: There's a secret code consisting of a sequence of five colored circles (items). Colors may appear more than once. Your job is ...
  • 22.4k
5 votes
1 answer
190 views

Word Mastermind

I have thought of a 6 letter word: but I'm not going to tell you what it is. Instead you give me 6 letter words, and I mark them according to the normal rules of Mastermind. A 'word' can be garbage ...
  • 35.4k
21 votes
5 answers
2k views

Single Colour Mastermind Problem

Imagine we're playing a game of mastermind with the usual eight colours, only this version has six holes across in which to place colours. And to make it easier for you I tell you that I have filled ...
6 votes
1 answer
249 views

Creatures from the Deep saw the heroes on a bridge

It was dark and cold in the land of Nemeria. A fellowship of heroes traversed a bridge in a straight line, one after another. Below them, only an abyss. They could hear the howling of strange ...
  • 1,595
11 votes
1 answer
951 views

Hacking a Safe Lock after 3 tries

My friend has a safe lock, with a numeric password of 4 digits (varying between 0-9 each). She lost the password and looked for my help. Fortunately, I was able to hack it. I could try some different ...
  • 1,595
16 votes
9 answers
3k views

crack this code #1965

Using the clues provided, determine the 'password'. 501 — Two correct numbers in wrong places 135 — One correct number in the ...
1 vote
2 answers
405 views

Mastermind encryption in least amount of steps possible?

I need to encode HA2QG into a mastermind number list. ex; Solve the code: 318 One number is correct and well placed 271 One number is correct but wrong placed 709 Two numbers are correct but wrong ...
0 votes
1 answer
257 views

Adaptation of Cows and Bulls [closed]

So as all of you know, Cows and Bulls is a pen and paper adaptation of the popular board game Mastermind. I would like to design a game that would allow duplicate numbers for the code and assign ...
3 votes
2 answers
411 views

Mastermind with an error

Mastermind is a code-breaking game for two players where people try to guess the opponents guesses. You can find the detail on wikipedia. The game you play with your friend is a little different, a ...
  • 28.9k
9 votes
2 answers
957 views

Mastermind puzzle - 6 rows each with one correct and one misplaced

Here is a relatively easy mastermind puzzle that I came up with a while ago, the aim is to find the hidden code like as if you were playing normally (you should not have to guess, there is more than ...
  • 3,659
10 votes
2 answers
27k views

Crack the 5 digits code

I created this "crack the code" puzzle. I hope the members here like it.
8 votes
2 answers
564 views

Guess n binary digits

There's a N (1 ≤ N ≤ 1 000; N is pair) digit binary number and you have a maximum of 2050 guesses to find out which is it. With each try, you will know one of the following: You got it right (100%); ...
24 votes
3 answers
1k views

Cryptic Mastermind

And now for something completely different: Cryptic Mastermind! Given below are five sets of five cryptic clues each, all resulting in five-letter words. The black and white pegs, like in regular ...
  • 10.4k
73 votes
9 answers
507k views

Crack the lock code

Does any one know how to crack this? I got this as a challenge.
13 votes
1 answer
2k views

What is the optimal first move in Mastermind?

For a given number of positions/holes and a given number of colors, which initial guess eliminates the most possibilities for the solution at a minimum? For 4 positions, it's AABB. What is it for 5, ...
6 votes
1 answer
676 views

History of "Bulls and Cows"

Bulls and Cows is a game that predates Mastermind but is closely related. The wikipedia has for first dates of Mastermind as 1970. What is the earliest reference to the game Bulls and Cows?
  • 5,328
0 votes
2 answers
2k views

Guess my number [duplicate]

There is a popular game called Mastermind in which one player guesses another player's secret sequence - it could be a word, some colors, or numbers. The guesser says a possible sequence, and they ...
  • 28.9k
18 votes
6 answers
4k views

Guess five binary digits!

Person A thinks of a 5 digit binary number. Person B tries to guess the number. B can guess a 5 digit binary number and A will respond with the number of correct digits (digits in the right place). ...
7 votes
1 answer
593 views

Mastermind - all but last attempt

This a variation of the traditional game mastermind. There are 4 pegs and 6 colors of pegs in the code (repeats allowed). All rules are as usual, except for this one: You are not given any hints (...
17 votes
3 answers
2k views

Bulls without cows: how many steps are needed to solve this?

I'm bad at this sort of optimization problem so I'm asking for you, proud riddle solvers! There's this huge hangar with 72 different airplanes. They come in six different colors Each color has four ...
  • 385
22 votes
9 answers
3k views

House Number Mastermind

I was having a house-leaving party at my old house, and challenged four of my friends to guess the number of the new address, which had three digits. The responses I got were 280, 376, 304, and 370....
30 votes
6 answers
178k views

Clever ways to solve Mastermind?

Is there any specific way to solve Mastermind? Apart from the first step that is pure chance, is there any way to continue based on the colors that you think are correct?