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Difficulty: 3 of 5 Latest: Let's party (in Numbers)
When W.G. invited us to his party he rewired the buttons' panel in the elevator and placed next to it a note:
Welcome.
The fun starts here and now. Originally the numbers were in sequence in a way that numbers 1 and 2 were neighbors - horizontally or vertically, 2 and 3 likewise and so on.
Now on 8 of 16 buttons the numbers were erased and then on 4 additional buttons the original numbers were replaced by the wrong ones.

Restore the original layout, press button 15 and join the fun!
Pressing any other button will get you 90 seconds or less of elevator music and a free ride to a wrong floor...

Can you locate the correct button?

 -x--x-11--x-
 -8-16--9--x-
 -6--x--x--4-
 -x--x-14--2-

Credit due to Mr Bob Stanton

(No Solution Yet, 2 Comments) Submitted on 2020-08-14 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: Pearls (in Weights and Scales) Rating: 2.71
You have nine pearls, one of which is (as is usually the case in these problems) fake. You know that the fake pearl weighs less than the others, but it is (of course) impossible to distinguish from the others in any other way.

What is the minimum number of weighings that must be performed to find the fake pearl? How would you go about it?

(Solution Posted, 9 Comments) Submitted on 2002-05-23 by levik   
Difficulty: 3 of 5What price glory? (in Just Math)
Posted on 2020-08-12 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 2 of 5Numbered Balls in Test Tubes 2 (in Logic)
Posted on 2020-08-10 by Charlie (Solution Posted, 5 Comments)
Difficulty: 4 of 5Cosine cups (in Shapes)
Posted on 2020-08-07 by Danish Ahmed Khan (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Three Digit Number 3 (in Numbers)
Posted on 2020-08-05 by Larry (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Erase a prime (in Numbers) Rating: 3.00
Posted on 2020-08-03 by Jer (No Solution Yet, 4 Comments)
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)

Recently Posted Solutions:
Difficulty: 3 of 5What price glory? (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2020-08-13 05:51:54
Difficulty: 2 of 5Numbered Balls in Test Tubes 2 (in Logic)
Submitted By Charlie. Solution posted on 2020-08-12 07:10:46
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
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