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Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
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Difficulty: 3 of 5 Latest: Repunits (in Numbers)
A repunit is an integer consisting entirely of ones, such as 1, 11, 111, etc. Let N be any integer not divisible by 2 or 5. Show that there is an integer M such that the product MN is a repunit.
(No Solution Yet, 0 Comments) Submitted on 2019-01-22 by Danish Ahmed Khan   
Difficulty: 3 of 5 Bonus: Name Game (in Logic) Rating: 2.59
George, Helen, and Steve are drinking coffee.
Bert, Karen, and Dave are drinking soda.
Using logic, is Elizabeth drinking coffee or soda?

(Solution Posted, 28 Comments) Submitted on 2003-07-12 by Chaz   
Difficulty: 3 of 5Square+27 (in Numbers)
Posted on 2019-01-22 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5An Average Student (in Numbers)
Posted on 2019-01-21 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 2 of 516 choices (in Just Math)
Posted on 2019-01-21 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 4 of 53^n is a sum of 3 squares (in Numbers)
Posted on 2019-01-20 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 5Extreme Rationalization (in Numbers)
Posted on 2019-01-19 by Danish Ahmed Khan (No Solution Yet, 4 Comments)
Difficulty: 3 of 5The source of two terms (in General)
Posted on 2019-01-18 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Worm ate the numbers (in Numbers)
Posted on 2019-01-18 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5From unrelated words to family (in Word Problems)
Posted on 2019-01-17 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 3 of 5From ab to ba (in Logic) Rating: 3.00
Posted on 2019-01-17 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Grid nim: 2xN (in Games) Rating: 4.00
Posted on 2019-01-16 by Jer (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Factorial Tremors (in Numbers)
Posted on 2019-01-16 by Danish Ahmed Khan (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Dial W for WORD (in Word Problems)
Posted on 2019-01-15 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Discounted velos (in Just Math)
Posted on 2019-01-15 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Reach home (in Just Math)
Posted on 2019-01-14 by Danish Ahmed Khan (No Solution Yet, 11 Comments)

Recently Posted Solutions:
Difficulty: 2 of 5Box of balls (in Probability)
Submitted By Ady TZIDON. Solution posted on 2019-01-12 03:39:50
Difficulty: 2 of 5A short list (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2019-01-09 03:38:37
Difficulty: 3 of 54 or more primes (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2019-01-04 08:24:14
Difficulty: 3 of 5Contradiction by erasure (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2019-01-04 08:10:25
Difficulty: 3 of 5Double perfection (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-12-30 02:55:05
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