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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: Rectangle Evasion (in Shapes)
Place 11 copies of the hexomino below in a 9x9 square such that no pair of hexominos forms a 3x4 rectangle.
+--+--+--+
|  |  |  |
+--+--+--+
|  |  |
+--+--+
|  |
+--+
(No Solution Yet, 0 Comments) Submitted on 2016-09-29 by Brian Smith   
Difficulty: 3 of 5 Bonus: Resting Sphere (in Geometry) Rating: 3.50
There is a perfect sphere of diameter 100 cms. resting up against a perfectly straight wall and a perfectly straight floor.
What is the diameter of the largest sphere that can pass through the gap between the wall, floor and the sphere ?
(Solution Posted, 18 Comments) Submitted on 2003-09-13 by Ravi Raja   
Difficulty: 3 of 5Carfax (in General)
Posted on 2016-09-29 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Unit Cube Paint Undertaking (in Shapes)
Posted on 2016-09-28 by K Sengupta (No Solution Yet, 6 Comments)
Difficulty: 2 of 5Cryptajoke XVI (in Word Problems)
Posted on 2016-09-28 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 4 of 5No data - just a weighing problem (in General)
Posted on 2016-09-27 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Two Primes From Prime (in Just Math) Rating: 4.00
Posted on 2016-09-27 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Number prediction (in Tricks)
Posted on 2016-09-26 by Charlie (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Cryptajoke XV (in Cryptography)
Posted on 2016-09-26 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Immobile Hexominos (in Shapes)
Posted on 2016-09-25 by Brian Smith (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Nineteen Divisibility Nuance (in Algorithms)
Posted on 2016-09-24 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Numbers' quantifiers (in Logic)
Posted on 2016-09-23 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Nonnegative Sum Nuance (in Probability)
Posted on 2016-09-23 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Find Function From Fraction (in Just Math)
Posted on 2016-09-22 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Capital City Conclusion 3 (in General)
Posted on 2016-09-22 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5A cyclic path (in Geometry)
Posted on 2016-09-21 by Ady TZIDON (No Solution Yet, 1 Comments)

Recently Posted Solutions:
Difficulty: 1 of 5Biting the Apple (in Tricks)
Submitted By Charlie. Solution posted on 2016-09-23 07:54:01
Difficulty: 3 of 5Area search (in Geometry)
Submitted By Ady TZIDON. Solution posted on 2016-09-21 06:28:37
Difficulty: 2 of 5Think twice (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2016-09-17 01:56:11
Difficulty: 3 of 5Bonne chance (in Logic)
Submitted By Ady TZIDON. Solution posted on 2016-09-08 09:08:39
Difficulty: 3 of 5Ten L-Hexominos (in Shapes)
Submitted By Brian Smith. Solution posted on 2016-09-02 23:21:11
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