| Name | Problem | Comments |
|---|---|---|
| New 15 Puzzle (Mitsuo Yoshizawa) |
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|
A little bit difficult? There are hints in Japanese. |
| 10 Puzzle (Mitsuo Yoshizawa) |
 Interchange the top row and the bottom row. |
The problem above was a little bit difficult. This problem and the next one are much easier; so try these if you could not solve the above. It might be interesting if you speculate how you can modify these problems by enlarging the horizontal and vertical sizes. |
| 14 Puzzle (Mitsuo Yoshizawa) |
 Interchange the top row and the bottom row. |
|
| Polyhedron Puzzle |
Glue
a regular tetrahedron with all edges length 1
and
a pyramid shaped polyhedron with all edges length 1
(the bottom is a square and the four sides are regular triangles)
by identifying a face of the tetrahedron and a side face of the pyramid.
How many faces does the resulted polyhedron have?
If you think you have the correct answer, then click here. |
This is a quiz rather than a puzzle. Do not jump to a conclusion! This was a problem in a math exam for high school students in US (circa 1980). It became famous since a student pointed out a mistake in the announced solution. |