Place a nonzero digit into some of the white cells of the grid. Shaded cells must remain blank. No digit can repeat in a row or column. In each row, the sum of the digits must be equal to some fixed value R (which you find during the solution). Similarly, in each column, the sum of the digits must be equal to some fixed value C. Circles in the grid give all the digits in the cells that touch the circle. (Including repeats; if two cells touching a circle have the same digit, the circle must co...| Recent Questions - Puzzling Stack Exchange
A unique puzzle for analytical minds. Do you dare to solve it? Rules: Fill the grid with all two-digit numbers (from 00 to 99), with no repetitions. In each row and each column, no two numbers may share the same tens digit. In each row and each column, no two numbers may share the same units digit. The colors are decoration. It sounds simple... until you try it. Good luck!| Recent Questions - Puzzling Stack Exchange
A Logician has 4 students. He decides to test them. He writes a number on a piece of paper and folds it. He says: “Listen. I have written a 2 digit positive integer on this paper and Raj, Ken and Amy will get to see it. Those three are allowed one correct written statement about the number without actually disclosing the number. Your written statement - which could be a clue - will allow Lisa to guess the number. Do not make it easy on her. You must be truthful.” Raj looks at the number, ...| Recent Questions - Puzzling Stack Exchange
This site has computer generated slitherlink puzzles that can be solved using the methods discussed in this Q&A SlitherLink on moderate or large boards: going beyond 0s and 3s For the largest regular puzzles (25x30, hard), and applying the techniques in the question linked above, I can solve such puzzles in about an hour, if I am lucky. My "record" is 49 minutes. I have all the assistants turned on (such as automatically marking completed squares). To complete such a puzzle in an hour, one ne...| Recent Questions - Puzzling Stack Exchange
Finally, you've made it to PuzzleWorld™! You're eager to enjoy activities such as riding the world-famous Non-Euclidean Coaster, taking a leisurely boat ride across the river with some number of wolves and sheep, and spending exactly $100 at the gift shop afterward. There's just one problem: two guards stand before you, blocking the entrance. Of course, you think to yourself. It wouldn't be PuzzleWorld™ without a riddle at the gate. You already know the rules, but even so, one of the guar...| Recent Questions - Puzzling Stack Exchange
Fill the squares with the right tetrominoes, so each tetromino contains numbers 1 to 4. Example:| Recent Questions - Puzzling Stack Exchange
I came up with a logic puzzle inspired by this xkcd comic. I don't yet have an answer, and I am wondering if anyone can come up with one. You are in a room with three doors. Two of the doors lead out, but one of them leads to certain death. Each door has a guard holding a spear stationed in front of it. One of the guards always lies, one always tells the truth, and the third guard will fatally stab you if you ask a tricky question. If the question isn't tricky, he will tell the truth. For thi...| Recent Questions - Puzzling Stack Exchange
3 2 1 4 1 2 3 3 3 3 3 4 6 4 4 2 3 4 4 3 1 1 2 4 3 The 5x5 table above contains numbers. A number X represents a statement that this cell is surrounded by (among its 8 neighbours) X true statements. If the number is 3 means the cell is surrounded by 3 true statements. We can say all statements are false, but this is not what I want. Some statements are true and some are not. Create another 5x5 table with boolean (T/F) input, to show which statements are true, and which statements are false. ex...| Recent Questions - Puzzling Stack Exchange
Problem: You're a vegetable gardener planning to plant out seedlings in a new garden bed, however your farmer's almanac has outlined a system of rules about what plants can and cannot be placed next to each other. Your job is to map out a garden bed/s that will provide the most benefits to the plants within. Each plant has 5 classes of companion plant associated with them, ranging from mutually beneficial plantings to stunting or being stunted by neighbour plants. For example, the rules for p...| Recent Questions - Puzzling Stack Exchange
Choose the conclusion that validly follows from the argument below. Some apples are edible. This means that there is at least one apple that is edible. No edible food is rotten. Therefore A. All apples are not rotten. B. Some apples are rotten. C. Some apples are not rotten. D. All apples are edible. E. B and C| Recent Questions - Puzzling Stack Exchange
In the image you can see twelve mutation chambers (A to L). Each alien on the left side of the aliens goes through the three mutation chambers of its right side. The alien on the right side is the ...| Puzzling Stack Exchange
Put the numbers from 1 to 6 in the puzzle in a way such that: In each row or column there shouldn't be duplicate numbers. The squares that are joined together have the same number.| Puzzling Stack Exchange
Puzzlein’ Nonogram — Solve the puzzles. Inspired from this great puzzle by @DyingIsFun. Click the image for larger view. (59x59) I’ll not require the full logical step. (If I do, I’ll be busy| Puzzling Stack Exchange
Grelling's Paradox is about certain types of words. An adjective is heterological if it does not describe itself, like 'long', 'German', or 'monosyllabic'. An adjective is autological if it does| Puzzling Stack Exchange