Some of my Puzzles

Nurikabe Puzzles

Late breaking news! You don't paper and pencil to work these Nurikable puzzles anymore. I've implemented then on Javascript boards:

  1. New   #22a, smallish but not easy
  2. New   #22b, much easier variation on #22a
  3. New   #22c, another variation on #22a
  4. Recommended   An interactive board on which to play the Wikipedia example.
  5. Recommended   An interactive board on which to play #1.
    #1, the very first Nurikabe I constructed, is also my favorite. While far from easy, it is quite do-able. Very early you will be able to locate the entire 14-chain. You will also be able to see white fences and constrained white regions that dictate the general paths of some black chains. (Click here for a little more on this hint.)
  6. Recommended   An interactive board on which to play #12.
  7. Recommended   An interactive board on which to play #11.
  8. Recommended   An interactive board on which to play #8.
  9. Funny-looking but valid and do-able   An interactive board on which to play #21.
  10. Slightly Recommended   An interactive board on which to play #10.
  11. Slightly Recommended   An interactive board on which to play #5.
  12. Slightly Recommended   An interactive board on which to play #18.
  13. Slightly Recommended   An interactive board on which to play #17.
  14. Slightly Recommended   An interactive board on which to play #20.
  15. Slightly Recommended   An interactive board on which to play #9.
  16. Recommended with hint   An interactive board on which to play #7.
  17. An interactive board on which to play #15.
  18. An interactive board on which to play #19.
  19. An interactive board on which to play #14.
  20. An interactive board on which to play #13.
  21. An interactive board on which to play #2.
    (#2 is very difficult, but easier with some OWFU deductions.)
  22. An interactive board on which to play #3.
  23. An interactive board on which to play #4.
  24. An interactive board on which to play #6.
  25. An interactive board on which to play #16.

I've started to construct Nurikabe puzzles. These are fun to solve! And fun to construct!

Since the large Nurikabes tended to be much too difficult, I started making smaller ones. #16 is my first 9x9 ... yet it seems to be as ridiculously difficult as some of the 13x13's!

I've numbered them in the order I created them, not by difficulty. It seems easier for me to construct hard ones than easy ones, so most of these are just too darned difficult to be fun. :-( (I dropped this project for four years, then did the Nurikabe Javascript and decided to make more puzzles, somewhat easier than before. #12 is the first of these new puzzles. For these I provide only the Nurikabe board, which will inform you when you have a correct solution. (If you give up and insist on knowing the solution, e-mail me.)

Each of these puzzles has exactly one solution. If you regard this fact as a given, you may be able to make certain special inferences (OWFU's, or only-way-for-uniqueness). Puzzle #11 is one where OWFU's might speed up the solution process.

Rather difficult but requiring no trial and error:

Very challenging, perhaps requiring deductions that could be classified as trial-and-error, but still fun and doable by expert nurikaber's:

Too Difficult, brutal trial and error seems to be required:

Dominoes Puzzles

Other Puzzles

On this site you can find software to generate battleship puzzles automatically. Here's one:
 q
3
r
3
s
2
t
3
u
3
v
1
w
0
x
1
y
2
z
2
A   7                                        
B   2                                        
C   0                                        
D   3                                        
E   2                                S    
F   1                                        
G   0                                        
H   0                                        
I   2                                        
J   3                                        

Here's the solution:
 q
3
r
3
s
2
t
3
u
3
v
1
w
0
x
1
y
2
z
2
A   7D    BBBB    S    D
B   2D                                D
C   0                                        
D   3    C    DD                    
E   2    C                        C    
F   1    C                                
G   0                                        
H   0                                        
I   2S                            S    
J   3        CCC                    

 

Here's another Battleship Puzzle:
 q
7
r
2
s
1
t
1
u
1
v
3
w
2
x
0
y
1
z
2
A   3                                        
B   1                                        
C   1                                        
D   1                                        
E   3                                S    
F   1                                        
G   5                                        
H   2                                        
I   2                                        
J   1                                        

Solution:
 q
7
r
2
s
1
t
1
u
1
v
3
w
2
x
0
y
1
z
2
A   3X            X    X            
B   1X                                    
C   1X                                    
D   1                        X            
E   3XX                        X    
F   1                    X                
G   5XXXX    X                
H   2                    X            X
I   2X                                X
J   1X