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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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> Logic	> Probability	> Shapes (2)	> General (1)
> Numbers	> Games	> Paradoxes	> Riddles
> Just Math	> Science	> Algorithms

Latest: A repunit product (in Word Problems)

TOP*SPA=(a 6-digit number)

There are numerous valid words yielding valid solutions,
but only one product consists of a chain of the same digit repeated 6 times!

This is the one we want!

Use of software not recommended, it is easily solvable by logical deduction.

(No Solution Yet, 0 Comments)

Submitted on 2017-08-19 by Ady TZIDON

Bonus: Close Neighbors (in Numbers) Rating: 4.29

We can label the squares of an 8 x 8 chess board from from 1 to 64 in 64! different ways.

For each arrangement we find D, the largest difference between the labels of two squares which are adjacent (orthogonally or diagonally).

What is the smallest possible D (and how would you prove it)?

(Solution Posted, 6 Comments)

Submitted on 2004-02-05 by DJ

Sixty is Special (in Geometry)
Posted on 2017-08-18 by Bractals (No Solution Yet, 0 Comments)

Planks across a ditch (in Shapes) Rating: 3.00
Posted on 2017-08-17 by Jer (No Solution Yet, 4 Comments)

Marbles in boxes (in Algorithms)
Posted on 2017-08-16 by Ady TZIDON (No Solution Yet, 5 Comments)

At the bridge club (in Logic)
Posted on 2017-08-15 by Ady TZIDON (No Solution Yet, 2 Comments)

The well-defined digit (in Numbers) Rating: 5.00
Posted on 2017-08-14 by Ady TZIDON (No Solution Yet, 5 Comments)

Ellipse in a Truncated Triangle (in Shapes)
Posted on 2017-08-13 by Brian Smith (No Solution Yet, 0 Comments)

Divisibility in a sequence (in Numbers)
Posted on 2017-08-12 by Danish Ahmed Khan (No Solution Yet, 2 Comments)

Bob and Alice make a poor choice (in Numbers)
Posted on 2017-08-11 by broll (No Solution Yet, 7 Comments)

Straight or rotated (in Numbers) Rating: 5.00
Posted on 2017-08-10 by Ady TZIDON (No Solution Yet, 3 Comments)

Even (related) chances (in Probability)
Posted on 2017-08-09 by Ady TZIDON (No Solution Yet, 4 Comments)

Palindromic sum (in Just Math)
Posted on 2017-08-08 by Danish Ahmed Khan (No Solution Yet, 3 Comments)

A text sans (in Word Problems)
Posted on 2017-08-07 by Ady TZIDON (No Solution Yet, 1 Comments)

Nondivisibility by 11 (in Just Math) Rating: 4.00
Posted on 2017-08-06 by Danish Ahmed Khan (No Solution Yet, 2 Comments)

A unique Heronian triangle (in Geometry)
Posted on 2017-08-05 by Jer (No Solution Yet, 6 Comments)

Recently Posted Solutions:

Erase one (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2017-08-13 02:29:55

Pruned Triangle (in Geometry)
Submitted By Bractals. Solution posted on 2017-08-10 10:25:56

QUICKIE X (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2017-08-08 03:41:42

Two sentences about Lady Chatterley (in Logic)
Submitted By ollie. Solution posted on 2017-08-07 04:08:33

The heavy couple (in Weights and Scales)
Submitted By Ady TZIDON. Solution posted on 2017-08-03 16:50:49

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