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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: 2 of 5 Latest: Erase a prime (in Numbers)
Write down the first n primes.

Erase one of them and the mean of the remaining numbers is 10.

What number did you erase?

(No Solution Yet, 1 Comments) Submitted on 2020-08-03 by Jer   
What are the next two numbers in the following sequence:

1, 2, -3, 4, -11, -2, -7, -24, 41, -38, 117, 44, . . .

(Solution Posted, 6 Comments) Submitted on 2004-12-05 by Brian Smith   
Difficulty: 3 of 5Yoshigahara's Masterpiece (in Logic)
Posted on 2020-07-31 by Jer (No Solution Yet, 1 Comments)
Difficulty: 3 of 5For all the tea in China (in Numbers)
Posted on 2020-07-29 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Gamow's Elevator (in Probability) Rating: 1.50
Posted on 2020-07-26 by Charlie (Solution Posted, 10 Comments)
Difficulty: 4 of 5Accelerating Sequence (in Sequences)
Posted on 2020-07-24 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Elementary nationality (in Tricks) Rating: 5.00
Posted on 2020-07-22 by Math Man (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Family Affair (in Word Problems)
Posted on 2020-07-20 by Charlie (Solution Posted, 1 Comments)
Difficulty: 2 of 5Two Sums of Two Squares (in Numbers) Rating: 4.50
Posted on 2020-07-17 by Brian Smith (No Solution Yet, 4 Comments)
Difficulty: 3 of 57 matches (in Word Problems) Rating: 3.00
Posted on 2020-07-15 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 2 of 5A prime and a cube (in Numbers) Rating: 4.50
Posted on 2020-07-13 by Brian Smith (Solution Posted, 8 Comments)
Difficulty: 3 of 57 hypotenuses (in Numbers)
Posted on 2020-07-10 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Why fight? (in Numbers) Rating: 3.00
Posted on 2020-07-08 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 3 of 5Four generations (in Numbers) Rating: 3.00
Posted on 2020-07-06 by Ady TZIDON (No Solution Yet, 9 Comments)
Difficulty: 3 of 5Life is like a cow pasture. (in Word Problems)
Posted on 2020-07-03 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 3 of 5Average other (in Numbers) Rating: 4.00
Posted on 2020-07-01 by Jer (No Solution Yet, 5 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Gamow's Elevator (in Probability)
Submitted By Charlie. Solution posted on 2020-07-31 15:38:38
Difficulty: 2 of 5Family Affair (in Word Problems)
Submitted By Charlie. Solution posted on 2020-07-31 15:38:25
Difficulty: 2 of 5Two expressions (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2020-07-30 04:23:20
Difficulty: 3 of 5Why fight? (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2020-07-19 08:04:07
Difficulty: 3 of 5A square question (in Games)
Submitted By Ady TZIDON. Solution posted on 2020-07-19 07:57:35
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