Mathematics & Logic

Hard Logic Puzzle Quiz

Challenge your mind with six demanding logic puzzles that test deduction, sequencing, and classic brain‑teaser skills.

#logic puzzles#brain teaser#riddle#critical thinking#puzzle challenge#hard math#deductive reasoning

Total Questions

Difficulty Level

hard

Progress

0/0

Quiz Questions

Answer all questions below and test your knowledge.

1
On an island, a knight always tells truth and a knave always lies. You meet three inhabitants A, B, and C. A says, "B is a knave." B says, "C is a knight." C says, "A and B are of different types." Which description matches their true types?
Question 1
2
Three switches outside a closed room control three bulbs inside. You may flip switches and enter the room only once. Which sequence lets you identify each bulb uniquely?
Question 2
3
A farmer must ferry a wolf, a goat, and a cabbage across a river using a boat that holds the farmer and one item. The wolf cannot be left alone with the goat, and the goat cannot be left alone with the cabbage. What is the minimum number of crossings required?
Question 3
4
In a row of five houses, each is a different color and houses a different pet. The blue house is immediately left of the red house. The green house has a cat. The yellow house's pet is a dog. The house with a fish is not at either end. Which color houses the fish?
Question 4
5
Four suspects—Anna, Ben, Cara, and Dan—make these statements: Anna says, "Ben is lying." Ben says, "Cara is truthful." Cara says, "Dan is lying." Dan says, "Anna is truthful." Exactly two of them tell the truth. Who are the truthful ones?
Question 5
6
In a standard 9x9 Sudoku, row 4 currently contains the digits 5,6,7,8 and three empty cells. Column 2 already has digits 1,2,3,4,5,6,7,8. Which digit must occupy the intersection of row 4 and column 2?
Question 6

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