Johan Myrberger's list of 3x3x3 cube puzzles (version 980210)
Comments, corrections and contributions are welcome!
MAIL: johan.myrberger@bigfoot.com
A: Block puzzles
A.1 The Soma Cube
______ ______ ______ ______
|\ \ |\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\ | \_____\
| | |____ _____| | | | | |____ | | |____
|\| | \ |\ \| | |\| | \ |\| | \
| *_____|_____\ | \_____*_____| | *_____|_____\ | *_____|_____\
| |\ \ | | |\ \ | | | |\ \ | | | |
\| \_____\ | \| \_____\ | \| | \_____\ \| | |
* | |___| * | |___| *_____| | | *_____|_____|
\| | \| | \| |
*_____| *_____| *_____|
______ ______ ____________
|\ \ |\ \ |\ \ \
| \_____\ | \_____\ | \_____\_____\
| | |__________ _____| | |____ _____| | | |
|\| | \ \ |\ \| | \ |\ \| | |
| *_____|_____\_____\ | \_____*_____|_____\ | \_____*_____|_____|
| | | | | | | | | | | | | |
\| | | | \| | | | \| | |
*_____|_____|_____| *_____|_____|_____| *_____|_____|
A.2 Half Hour Puzzle
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
| | |__________ _____| | |____ | | |__________
|\| | \ \ |\ \| | \ |\| | \ \
| *_____|_____\_____\ | \_____*_____|_____\ | *_____|_____\_____\
| | | | | | | | | | | | |\ \ |
\| | | | \| | | | \| | \_____\ |
*_____|_____|_____| *_____|_____|_____| *_____| | |___|
\| |
*_____|
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
_____| | | _____| | | | | |
|\ \| | |\ \| | |\| |
| \_____*_____| | \_____*_____|______ ___!_*_____|______
| |\ \ | | | |\ \ \ |\ \ \ \
\| \_____\ | \| | \_____\_____\ | \_____\_____\_____\
* | |___| *_____| | | | | | | | |
\| | \| | | \| | | |
*_____| *_____|_____| *_____|_____|_____|
A.3 Steinhaus's dissected cube
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
| | |__________ _____| | | | | |____
|\| | \ \ |\ \| | |\| | \
| *_____|_____\_____\ | \_____*_____| | *_____|_____\
| | | | | | |\ \ | | | |\ \
\| | | | \| \_____\ | \| | \_____\
*_____|_____|_____| * | |___| *_____| | |
\| | \| |
*_____| *_____|
____________ ______ ______
|\ \ \ |\ \ |\ \
| \_____\_____\ | \_____\ | \_____\
| | | | | | | ___________| | |
\| | | |\| | |\ \ \| |
*_____|_____|______ _________!_*_____| | \_____\_____*_____|
\ |\ \ \ |\ \ \ \ | | |\ \ |
\| \_____\_____\ | \_____\_____\_____\ \| | \_____\ |
* | | | | | | | | *_____| | |___|
\| | | \| | | | \| |
*_____|_____| *_____|_____|_____| *_____|
A.4
______
|\ \
| \_____\
| | |____ Nine of these make a 3x3x3 cube.
|\| | \
| *_____|_____\
| | | |
\| | |
*_____|_____|
A.5
______ ____________
|\ \ |\ \ \
| \_____\ | \_____\_____\
____________ | | |____ | | | |
|\ \ \ |\| | \ |\| | |
| \_____\_____\ | *_____|_____\ | *_____|_____|
| | | | | | | | | | | |
\| | | \| | | \| | |
*_____|_____| *_____|_____| *_____|_____|
______ ______
|\ \ |\ \
| \_____\ | \_____\
______ ______ | | |____ | | |__________
|\ \ |\ \ |\| | \ |\| | \ \
| \_____\ | \_____\ | *_____|_____\ | *_____|_____\_____\
| | |___| | | | | | |____ | | | | |
|\| | \| | |\| | | \ |\| | | |
| *_____|_____*_____| | *_____|_____|_____\ | *_____|_____|_____|
| | | | | | | | | | | | | | |
\| | | | \| | | | \| | | |
*_____|_____|_____| *_____|_____|_____| *_____|_____|_____|
A.6
______ ______ ______ ______
|\ \ |\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\ | \_____\
| | |____ _____| | | | | |____ | | |____
|\| | \ |\ \| | |\| | \ |\| | \
| *_____|_____\ | \_____*_____| | *_____|_____\ | *_____|_____\
| |\ \ | | |\ \ | | | |\ \ | | | |
\| \_____\ | \| \_____\ | \| | \_____\ \| | |
* | |___| * | |___| *_____| | | *_____|_____|
\| | \| | \| |
*_____| *_____| *_____|
______ ____________ ____________
|\ \ |\ \ \ |\ \ \
| \_____\ | \_____\_____\ | \_____\_____\
_____| | |____ _____| | | | _____| | | |
|\ \| | \ |\ \| | | |\ \| | |
| \_____*_____|_____\ | \_____*_____|_____| | \_____*_____|_____|
| | | | | | | | | | | | |
\| | | | \| | | \| | |
*_____|_____|_____| *_____|_____| *_____|_____|
A.7
____________
|\ \ \
| \_____\_____\
| | | |
|\| | | Six of these and three unit cubes make a 3x3x3 cube.
| *_____|_____|
| | | |
\| | |
*_____|_____|
A.8 Oskar's
____________ ______
|\ \ \ |\ \
| \_____\_____\ | \_____\
_____| | | | | | |__________ __________________
|\ \| | | |\| | \ \ |\ \ \ \
| \_____*_____|_____| x 5 | *_____|_____\_____\ | *_____\_____\_____\
| | | | | | | | | | | | | |
\| | | \| | | | \| | | |
*_____|_____| *_____|_____|_____| *_____|_____|_____|
A.9 Trikub
____________ ______ ______
|\ \ \ |\ \ |\ \
| \_____\_____\ | \_____\ | \_____\
| | | | | | |__________ _____| | |____
|\| | | |\| | \ \ |\ \| | \
| *_____|_____| | *_____|_____\_____\ | \_____*_____|_____\
| | | | | | | | | | | | | |
\| | | \| | | | \| | | |
*_____|_____| *_____|_____|_____| *_____|_____|_____|
______ ______ ____________
|\ \ |\ \ |\ \ \
| \_____\ | \_____\ | \_____\_____\
| | |____ | | |____ _____| | | |
|\| | \ |\| | \ |\ \| | |
| *_____|_____\ | *_____|_____\ | \_____*_____|_____|
| |\ \ | | | |\ \ | | | |
\| \_____\ | \| | \_____\ \| | |
* | |___| *_____| | | *_____|_____|
\| | \| |
*_____| *_____|
and three single cubes in a different colour.
The object is to build 3x3x3 cubes with the three single cubes in various
positions.
E.g: * * * as center * * * as edge * *(3) as * *(2) as
* S * * * * *(2)* space *(2)* center
* * * * * S (1)* * diagonal (2)* * diagonal
(The other two variations with the single cubes in a row are impossible)
A.10
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
_____| | | | | |____ | | |____
|\ \| | |\| | \ |\| | \
| \_____*_____| | *_____|_____\ ___|_*_____|_____\
| |\ \ | | | |\ \ |\ \ \ |
\| \_____\ | \| | \_____\ | \_____\_____\ |
* | |___| *_____| | | | | | |___|
\| | \| | \| | |
*_____| *_____| *_____|_____|
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
| | |__________ _____| | |____ | | |____
|\| | \ \ |\ \| | \ |\| | \
| *_____|_____\_____\ | \_____*_____|_____\ | *_____|_____\______
| |\ \ | | | | | | | | | |\ \ \
\| \_____\ | | \| | | | \| | \_____\_____\
* | |___|_____| *_____|_____|_____| *_____| | | |
\| | \| | |
*_____| *_____|_____|
B: Blocks mounted on bricks
B.1
______
|\ \
| \_____\ ______
_____| | |____ ______ ______ |\ \
|\ \| | \ |\ \ |\ \ | \_____\
| \_____*_____|_____\ | \_____\ | \_____\ | | |
| | | | | | | |___| | | |\| |
|\| | | ___!__ |\| | \| | | *_____|
| *_____|_____|_|\ \ | *_____|_____*_____| | | |
| | | | | \_____\ | | |\ \ | _______|\| |__
\| | ___!_| | | \| | \_____\ | \ \| *_____| \
*_____|_|\ \| | *_____| | |___| \_____| | |___\
\ \| \_____*_____| \ \| | \ \ \| | \
\_____| | | | \_____*_____|_____\ \_____*_____|_____\
\ \| | | \ \ \ \ \ \ \ \
\_____*_____|_____| \_____\_____\_____\ \_____\_____\_____\
______ ______
|\ \ |\ \
| \_____\ | \_____\
______ | | | | | |
|\ \ |\| | |\| |
___!_\_____\ ___!_*_____| | *_____|
_______|\ \ | _______|\ \ | ___________| | |
\ \| \_____\ | \ \| \_____\ | \ \ \| |
\_____| | |___| \_____| |\ \__| \_____\_____|_____|
\ \| | \ \ \| \_____\ \ \ \ \ \
\_____*_____|_____\ \_____* | |___\ \_____\_____\_____\
\ \ \ \ \ \| | \ \ \ \ \
\_____\_____\_____\ \_____*_____|_____\ \_____\_____\_____\
This type of puzzle can also be representated with numbers in a square,
the numbers showing the height of each pile.
E.g. B.1 would be:
2 3 2 2 1 2 0 0 0 0 0 1 0 0 2 0 0 2
0 0 0 0 1 0 0 3 0 0 1 0 0 1 0 0 0 0
0 1 2 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
B.2
0 0 1 2 1 1 0 0 0 0 0 0 2 0 0 0 0 0
0 0 0 0 1 0 1 0 3 0 0 0 0 1 1 2 3 0
0 0 0 0 0 0 2 0 2 2 0 0 0 0 1 0 0 0
B.3
0 0 2 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1
0 0 1 0 0 0 0 2 0 0 1 2 3 0 1 0 0 0
3 0 1 0 3 0 0 1 1 1 0 0 0 0 0 0 2 0
B.4
____________ ____________ ____________
|\ \ \ |\ \ \ |\ \ \
| \_____\_____\ | \_____\_____\ | \_____\_____\
| | | | | | | | | | | |
|\| | | |\| | | \| | |
| *_____|_____| | *_____|_____| *_____|_____|
| | |____ | |\ \ | | |____
|\| | \ |\| \_____\ |\| | \
| *_____|_____\ | * | | | *_____|_____\
_____| | | | _____| |\| |__ _____| | | |
\ \| | | \ \| *_____| \ \ \| | |
\_____*_____|_____| \_____|_____|_____\ \_____|_____|_____|
\ \ \ \ \ \ \ \ \ \ \ \
\_____\_____\_____\ \_____\_____\_____\ \_____\_____\_____\
\ \ \ \ \ \ \ \ \ \ \ \
\_____\_____\_____\ \_____\_____\_____\ \_____\_____\_____\
____________ ______ __________________
|\ \ \ |\ \ |\ \ \ \
| \_____\_____\ | \_____\ | \_____\_____\_____\
| | | | | | | | | | | |
|\| | | |\| | \| | | |
| *_____|_____| | *_____| *_____|_____|_____|
| | | | | | | | |
|\| | |\| | |\| |
| *_____| | *_____| | *_____|
_____| | |____ _____| | |____ _____| | |____
\ \| | \ \ \| | \ \ \| | \
\_____*_____|_____\ \_____|_____|_____\ \_____|_____|_____\
\ \ \ \ \ \ \ \ \ \ \ \
\_____\_____\_____\ \_____\_____\_____\ \_____\_____\_____\
\ \ \ \ \ \ \ \ \ \ \ \
\_____\_____\_____\ \_____\_____\_____\ \_____\_____\_____\
C: Coloured blocks puzzles
C.1 Kolor Kraze
Thirteen pieces.
Each subcube is coloured with one of nine colours as shown below.
The object is to form a cube with nine colours on each face.
______
|\ \
| \_____\
| | | ______ ______ ______ ______ ______ ______
|\| 1 | |\ \ |\ \ |\ \ |\ \ |\ \ |\ \
| *_____| | \_____\ | \_____\ | \_____\ | \_____\ | \_____\ | \_____\
| | | | | | | | | | | | | | | | | | | | |
|\| 2 | |\| 2 | |\| 2 | |\| 4 | |\| 4 | |\| 7 | |\| 9 |
| *_____| | *_____| | *_____| | *_____| | *_____| | *_____| | *_____|
| | | | | | | | | | | | | | | | | | | | |
\| 3 | \| 3 | \| 1 | \| 1 | \| 5 | \| 5 | \| 5 |
*_____| *_____| *_____| *_____| *_____| *_____| *_____|
______ ______ ______ ______ ______ ______
|\ \ |\ \ |\ \ |\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\ | \_____\ | \_____\ | \_____\
| | | | | | | | | | | | | | | | | |
|\| 9 | |\| 9 | |\| 3 | |\| 6 | |\| 6 | |\| 6 |
| *_____| | *_____| | *_____| | *_____| | *_____| | *_____|
| | | | | | | | | | | | | | | | | |
\| 7 | \| 8 | \| 8 | \| 8 | \| 7 | \| 4 |
*_____| *_____| *_____| *_____| *_____| *_____|
C.2
Given nine red, nine blue and nine yellow cubes.
Form a 3x3x3 cube in which all three colours appears in each of the 27
orthogonal rows.
C.3
Given nine red, nine blue and nine yellow cubes.
Form a 3x3x3 cube so that every row of three (the 27 orthogonal rows, the 18
diagonal rows on the nine square cross-sections and the 4 space diagonals)
contains neither three cubes of like colour nor three of three different
colours.
C.4
Nine pieces, three of each type.
Each subcube is coloured with one of three colours as shown below.
The object is to build a 3x3x3 cube in which all three colours appears in each
of the 27 orthogonal rows. (As in C.2)
______ ______ ______
|\ \ |\ \ |\ \
| \_____\ | \_____\ | \_____\
| | |____ | | |____ | | |____
|\| A | \ x 3 |\| B | \ x 3 |\| A | \ x 3
| *_____|_____\ | *_____|_____\ | *_____|_____\
| | | | | | | | | | | |
\| B | C | \| A | C | \| C | B |
*_____|_____| *_____|_____| *_____|_____|
D: Strings of cubes
D.1 Pululahua's dice
27 cubes are joined by an elastic thread through the centers of the cubes
as shown below.
The object is to fold the structure to a 3x3x3 cube.
____________________________________
|\ \ \ \ \ \ \
| \_____\_____\_____\_____\_____\_____\
| | | | | | | |
|\| :··|·····|··: | :··|·····|··: |
| *__:__|_____|__:__|__:__|_____|__:__|
| | : |___| | : | : |___| | : |
|\| : | \| ···|··· | \| : |
| *__:__|_____*_____|_____|_____*__:__|
| | : | | |___| | | : |____
\| ···|·····|··: | \| :··|··· | \
*_____|_____|__:__|_____*__:__|_____|_____\
| | : | | : | | |
|\| : | + | ···|·····|··: |
| *__:__|__:__|_____|_____|__:__|
| | : | : | | | : |
\| + | : | :··|·····|··· |
*_____|__:__|__:__|_____|_____|
| | : | : |
\| ···|··· |
*_____|_____|
D.1.X The D.1 puzzle type exploited by Glenn A. Iba (quoted)
INTRODUCTION
"Chain Cube" Puzzles consist of 27 unit cubies
with a string running sequentially through them. The
string always enters and exits a cubie through the center
of a face. The typical cubie has one entry and one exit
(the ends of the chain only have 1, since the string terminates
there). There are two ways for the string to pass through
any single cubie:
1. The string enters and exits non-adjacent faces
(i.e. passes straight through the cubie)
2. It enters and exits through adjacent faces
(i.e. makes a "right angle" turn through
the cubie)
Thus a chain is defined by its sequence of straight steps and
right angle turns. Reversing the sequence (of course) specifies
the same chain since the chain can be "read" starting from either
end. Before making a turn, it is possible to "pivot" the next
cubie to be placed, so there are (in general) 4 choices of
how to make a "Turn" in 3-space.
The object is to fold the chain into a 3x3x3 cube.
It is possible to prove that any solvable sequence must
have at least 2 straight steps. [The smallest odd-dimensioned
box that can be packed by a chain of all Turns and no Straights
is 3x5x7. Not a 3x3x3 puzzle, but an interesting challenge.
The 5x5x5 can be done too, but its not the smallest in volume].
With the aid of a computer search program I've produced
a catalog of the number of solutions for all (solvable) sequences.
Here is an example sequence that has a unique solution (up to reflections
and rotations):
(2 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 2 2 1 1)
the notation is a kind of "run length" coding,
where the chain takes the given number of steps in a straight line,
then make a right-angle turn. Equivalently, replace
1 by Turn,
2 by Straight followed by a Turn.
The above sequence was actually a physical puzzle I saw at
Roy's house, so I recorded the sequence, and verified (by hand and computer)
that the solution is unique.
There are always 26 steps in a chain, so the "sum" of the
1's and 2's in a pattern will always be 26. For purposes
of taxonomizing, the "level" of a string pattern is taken
to be the number of 2's occuring in its specification.
COUNTS OF SOLVABLE AND UNIQUELY SOLVABLE STRING PATTERNS
(recall that Level refers to the number of 2's in the chain spec)
Level Solvable Uniquely
Patterns Solvable
0 0 0
1 0 0
2 24 0
3 235 15
4 1037 144
5 2563 589
6 3444 1053
7 2674 1078
8 1159 556
9 303 187
10 46 34
11 2 2
12 0 0
13 0 0
_______ ______
Total Patterns: 11487 3658
SOME SAMPLE UNIQUELY SOLVABLE CHAINS
In the following the format is:
( #solutions palindrome? #solutions-by-start-type chain-pattern-as string )
where
#solutions is the total number of solutions up to reflections and rotations
palindrome? is T or NIL according to whether or not the chain is a palindrome
#solutions by-start-type lists the 3 separate counts for the number of
solutions starting the chain of in the 3 distinct possible ways.
chain-pattern-as-string is simply the chain sequence
My intuition is that the lower level chains are harder to solve,
because there are fewer straight steps, and staight steps are generally
more constraining. Another way to view this, is that there are more
choices of pivoting for turns because there are more turns in the chains
at lower levels.
Here are the uniquely solvable chains for level 3:
(note that non-palindrome chains only appear once --
I picked a "canonical" ordering)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Level 3 ( 3 straight steps) -- 15 uniquely solvable patterns
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(1 NIL (1 0 0) "21121111112111111111111")
(1 NIL (1 0 0) "21121111111111111121111")
(1 NIL (1 0 0) "21111112112111111111111")
(1 NIL (1 0 0) "21111111211111111111112")
(1 NIL (1 0 0) "12121111111111112111111")
(1 NIL (1 0 0) "11211211112111111111111")
(1 NIL (1 0 0) "11112121111111211111111")
(1 NIL (1 0 0) "11112112112111111111111")
(1 NIL (1 0 0) "11112112111111211111111")
(1 NIL (1 0 0) "11112111121121111111111")
(1 NIL (1 0 0) "11112111111211211111111")
(1 NIL (1 0 0) "11112111111112121111111")
(1 NIL (1 0 0) "11111121122111111111111")
(1 NIL (1 0 0) "11111112122111111111111")
(1 NIL (1 0 0) "11111111221121111111111")
D.2 Magic Interlocking Cube
(Glenn A. Iba quoted)
This chain problem is marketed as "Magic Interlocking Cube --
the Ultimate Cube Puzzle". It has colored cubies, each cubie having
6 distinctly colored faces (Red, Orange, Yellow, Green, Blue, and White).
The object is to fold the chain into a 3x3x3 cube with each face
being all one color (like a solved Rubik's cube). The string for
the chain is actually a flexible rubber band, and enters a cubie
through a (straight) slot that cuts across 3 faces, and exits
through another slot that cuts the other 3 faces. Here is a rough
attempt to picture a cubie:
(the x's mark the slots cut for the rubber band to enter/exit)
__________
/ /|
xxxxxxxxxxx |
/ / x |
/_________/ x |
| | x |
| | |
| | /
| x | /
| x | /
| x |/
-----x-----
Laid out flat the cubie faces would look like this:
_________
| |
| |
| x |
| x |
|____x____|_________ _________ _________
| x | | | |
| x | | | |
| x | x x x x x x x x x x x |
| x | | | |
|____x____|_________|_________|_________|
| x |
| x |
| x |
| |
|_________|
The structure of the slots gives 3 choices of entry face, and 3 choices
of exit face for each cube.
It's complicated to specify the topology and coloring but here goes:
Imagine the chain stretched out in a straight line from left to right.
Let the rubber band go straight through each cubie, entering and
exiting in the "middle" of each slot.
It turns out that the cubies are colored so that opposite faces are
always colored by the following pairs:
Red-Orange
Yellow-White
Green-Blue
So I will specify only the Top, Front, and Left colors of each
cubie in the chain. Then I'll specify the slot structure.
Color sequences from left to right (colors are R,O,Y,G,B,and W):
Top: RRRRRRRRRRRRRRRRRRRRRRRRRRR
Front: YYYYYYYYYYYYWWWYYYYYYYYYYYY
Left: BBBBBGBBBGGGGGGGGGBBGGGGBBB
For the slots, all the full cuts are hidden, so only
the "half-slots" appear.
Here is the sequence of "half slots" for the Top (Red) faces:
(again left to right)
Slots: ><><><><<><><<<><><>>>>><>>
Where
> = slot goes to left
< = slot goes to right
To be clearer,
> (Left):
_______
| |
| |
xxxxx |
| |
|_______|
< (Right):
_______
| |
| |
| xxxxx
| |
|_______|
Knowing one slot of a cubie determines all the other slots.
I don't remember whether the solution is unique. In fact I'm not
certain whether I actually ever solved it. I think I did, but I don't
have a clear recollection.
E: Blocks with pins
E.1 Holzwurm (Torsten Sillke quoted)
Inventer: Dieter Matthes
Distribution:
Pyramo-Spiele-Puzzle
Silvia Heinz
Sendbuehl 1
D-8351 Bernried
tel: +49-9905-1613
Pieces: 9 tricubes
Each piece has one hole (H) which goes through the entire cube.
The following puctures show the tricubes from above. The faces
where you see a hole are marked with 'H'. If you see a hole at
the top then there is a hole at the bottom too. Each peace has
a worm (W) one one face. You have to match the holes and the
worms. As a worm fills a hole completely, you can not put two
worms at both ends of the hole of the same cube.
__H__ _____ _____
| | | | | |
| | | |W | |
|_____|_____ |_____|_____ |_____|_____
| | | | | | | | |
| | |W | | |H | H | |W
|_____|_____| |_____|_____| |_____|_____|
____ _____ _____
| | | | | |
| H | | | | W |
|_____|_____ |_____|_____ |_____|_____
| | | | | | | | |
| | | | W | H | | | H |
|_____|_____| |_____|_____| |_____|_____|
W
__W__ _____ _____
| | | | | |
| | H| |H | |
|_____|_____ |_____|_____ |_____|_____
| | | | | | | | |
| | H | | | | H| | W |
|_____|_____| |_____|_____| |_____|_____|
W
Aim: build a 3*3*3 cube without a worm looking outside.
take note, it is no matching problem, as
| |
worm> H| |H geometry/coloring/cheese.cube.p <==
A cube of cheese is divided into 27 subcubes. A mouse starts at one
corner and eats through every subcube. Can it finish in the middle?
==> geometry/coloring/cheese.cube.s <==
Give the subcubes a checkerboard-like coloring so that no two adjacent
subcubes have the same color. If the corner subcubes are black, the
cube will have 14 black subcubes and 13 white ones. The mouse always
alternates colors and so must end in a black subcube. But the center
subcube is white, so the mouse can't end there.
F.4
Cut the 3*3*3 cube into single cubes. At each slice you can
rearrange the blocks. Can you do it with fewer than 6 cuts?