
1. 
pretorik 
 
161 
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markr 
 
116 
3. 
Gordon Weir 
 
104 
4. 
mbloomfi 
 
97 
5. 
Dennis Nazarov 
 
96 
6. 
zzz123 
 
72 
7. 
Srikanta 
 
56 
8. 
lidSpelunker 
 
53 
9. 
SAMIH FAHMY 
 
48 
10. 
jkr 
 
44 




1. 
denisR, mishik 
 
236 
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alan, De_Bill 
 
231 
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dddfff 
 
228 
4. 
kavfy 
 
221 
5. 
idler_ 
 
106 
6. 
akajobe 
 
94 
7. 
tolstyi 
 
56 
8. 
STARuK 
 
42 
9. 
vale 
 
31 
10. 
xandr 
 
11 





A Megamind walked one mile South, one mile East, and one mile North,
after which he arrived at the starting point of his trip. Where on
planet Earth could such a trip take place? 


Puzzle statistics "Walking the Earth".
Last updated 5305726.6 minutes ago.

Solved by: 23
Daily average: 0
Answers submitted: 67
Viewed by: 296
Fraction solved by: 7.7%
Solved at first attempt: 34.7%
Average discussion length: 3.7
Liked the puzzle: 9
Did not like the puzzle:
1

A Megamind in a boat 
Geometry puzzles 

Weight: 4 

Liked the puzzle: 100% 

27.12.2009 

A Megamind is sitting in a boat at the center of a circular lake of
radius R. On the lake shore, an evil Goblin awaits. Luckily for the
Megamind, the Goblin can only move along the shore. Unfortunately, the
Goblin is 4 times as fast as the Megamind in his boat. The Megamind
can save himself if he gets to the shore and evades meeting with the
Goblin. Can the Megamind save himself? If yes  how? 


Puzzle statistics "A Megamind in a boat".
Last updated 5305726.6 minutes ago.

Solved by: 10
Daily average: 0
Answers submitted: 18
Viewed by: 296
Fraction solved by: 3.3%
Solved at first attempt: 90%
Average discussion length: 1.2
Liked the puzzle: 4
Did not like the puzzle:
0


What is the minimal number of straight cuts required to split a 3x3x3
cube into 27 1x1x1 cubes? Pieces can be rearranged arbitrarily between
the cuts. The answer should justify the minimality. 


Puzzle statistics "Cutting the cube".
Last updated 5305726.6 minutes ago.

Solved by: 19
Daily average: 0
Answers submitted: 22
Viewed by: 296
Fraction solved by: 6.4%
Solved at first attempt: 89.4%
Average discussion length: 1.3
Liked the puzzle: 4
Did not like the puzzle:
1

Six matches and triangles 2 
Geometry puzzles 

Weight: 4 

Liked the puzzle: 100% 

07.02.2010 

How to make one equilateral and three isosceles (and not equilateral!) triangles using 6 sticks of the same length? Sticks cannot be broken and/or laid over each other and no free ends of the matches may be left. 


Puzzle statistics "Six matches and triangles 2".
Last updated 5305726.6 minutes ago.

Solved by: 5
Daily average: 0
Answers submitted: 15
Viewed by: 273
Fraction solved by: 1.8%
Solved at first attempt: 40%
Average discussion length: 2.2
Liked the puzzle: 3
Did not like the puzzle:
0


A birthday cake has a form of triangle. Two Megaminds divide as follows: One chooses a point in the triangle, and the other cuts the triangle by a segment passing through this point. The cutter then takes the bigger part. What is the maximal part of the cake guaranteed to be left to the first Megamind? The thickness of the cake is constant. 


Puzzle statistics "Triangular cake".
Last updated 5305726.6 minutes ago.

Solved by: 5
Daily average: 0
Answers submitted: 10
Viewed by: 296
Fraction solved by: 1.6%
Solved at first attempt: 80%
Average discussion length: 2.6
Liked the puzzle: 1
Did not like the puzzle:
1


Four toy cars are moving with constant velocities on a flat surface. Their velocities are not parallel, and the cars had started to move a while ago. After a collision, each car continues to move with the same velocity, but it disintegrates after three collisions. Five collisions involving two cars each had already happened, and two toys had disintegrated. What is the fate of the remaining two toys? 


Puzzle statistics "Toy cars on a surface".
Last updated 5305726.6 minutes ago.

Solved by: 5
Daily average: 0
Answers submitted: 9
Viewed by: 296
Fraction solved by: 1.6%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 0
Did not like the puzzle:
0

The telephone cable 2 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

01.01.2010 

The Megamind has a square parcel of land of size 1x1 km. Accidentally, he has found out that the devious Occupants had buried a telephone cable through his land and use it for their devious communications. The cable is buried along a straight line crossing the square land plot. After discovering this, the Megamind got his shovel and... paused to think. What is the shortest trench that the Megamind has to dig to find the cable? The trench may be disconnected. The proof of optimality is not required. 


Puzzle statistics "The telephone cable 2".
Last updated 5305726.6 minutes ago.

Solved by: 8
Daily average: 0
Answers submitted: 15
Viewed by: 295
Fraction solved by: 2.7%
Solved at first attempt: 75%
Average discussion length: 3.6
Liked the puzzle: 4
Did not like the puzzle:
0

Four spheres and a cylinder 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

26.01.2010 

Four spheres and an infinite cylinder are arranged on a plane so that all these solids touch each other and the plane. The cylinder has radius 1cm. Describe the spatial arrangement of these solids and find the radii of all spheres. 


Puzzle statistics "Four spheres and a cylinder".
Last updated 5305726.6 minutes ago.

Solved by: 3
Daily average: 0
Answers submitted: 5
Viewed by: 276
Fraction solved by: 1%
Solved at first attempt: 100%
Average discussion length: 1.0
Liked the puzzle: 2
Did not like the puzzle:
0

Divide a parallelogram 
Geometry puzzles 

Weight: 5 

Liked the puzzle: 100% 

02.04.2011 

How to divide a parallelogram into 9 isosceles triangles? 


Puzzle statistics "Divide a parallelogram".
Last updated minutes ago.

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