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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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> Numbers (1)> Games> Paradoxes> Riddles
> Just Math> Science> Algorithms
Difficulty: 4 of 5 Latest: Just a search (in Numbers)
List all prime numbers below 3000 that can be expressed
as a^2 + n*b^2 for all integer n's from 1 to 10.
(No Solution Yet, 5 Comments) Submitted on 2018-08-18 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: Four Spheres (in Famous Riddles) Rating: 5.00
I have four spheres
but I am not round
I am in a prison of water
but I do not drown
What am I?
(Solution Posted, 3 Comments) Submitted on 2007-03-10 by Minerva   
Difficulty: 4 of 5Ant highway (in Shapes)
Posted on 2018-08-17 by Jer (No Solution Yet, 3 Comments)
Difficulty: 3 of 5In Memoriam (in Numbers) Rating: 5.00
Posted on 2018-08-16 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Roll away (in Calculus)
Posted on 2018-08-15 by Jer (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Tippy table (in Shapes)
Posted on 2018-08-14 by Jer (No Solution Yet, 2 Comments)
Difficulty: 2 of 531 created by 4 successive integers (in Numbers)
Posted on 2018-08-13 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 2 of 5Jeopardy-style A&Q (in Numbers) Rating: 5.00
Posted on 2018-08-12 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Quintuplet of consecutive primes (in Numbers)
Posted on 2018-08-11 by Ady TZIDON (Solution Posted, 1 Comments)
Difficulty: 3 of 5Attendance Records (in Numbers)
Posted on 2018-08-10 by Charlie (Solution Posted, 3 Comments)
Difficulty: 2 of 5Six or less? (in Just Math)
Posted on 2018-08-09 by Ady TZIDON (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Art is marching on.. (in Word Problems)
Posted on 2018-08-08 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Shirtless ? Even nude! (in Numbers)
Posted on 2018-08-07 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5When P. meets F. (in Just Math)
Posted on 2018-08-06 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 57 in row (in Numbers)
Posted on 2018-08-05 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Goldbach's double (in Just Math)
Posted on 2018-08-04 by Ady TZIDON (No Solution Yet, 0 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Quintuplet of consecutive primes (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-08-18 04:23:21
Difficulty: 4 of 5Call 911 (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2018-08-17 08:57:37
Difficulty: 3 of 5Attendance Records (in Numbers)
Submitted By Charlie. Solution posted on 2018-08-13 14:29:44
Difficulty: 3 of 5Special feature (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-08-06 20:58:39
Difficulty: 2 of 5Happy New Year (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2018-08-05 15:18:55
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