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03 December 2010 @ 12:44 am
Friday Puzzle #78 - Star Battle  
Participating in international puzzle events like the World Puzzle Championship introduces one to a wide world of logic puzzles. Or, in the case of this puzzle, something out of this world. Unfortunately, there are no lasers or space ships in Star Battle puzzles, which was certainly my first thought when I ran into the puzzle's name many years ago.

Star Battle is an object placement puzzle (with some familiar features from more common puzzles like Sudoku and Battleships) that has its own intriguing logic to deduce. This week I've made two Star Battle puzzles for you to enjoy. What I'd call the "SB" star battle is easy, while the "4J" puzzle is a little bit trickier (but hardly impossible; it's more like a medium).

Rules: Place stars into some cells in the grid so that each row, column, and region contains exactly two stars (in the example, just one star). Stars cannot be placed in adjacent cells, not even diagonally.

Example:


Puzzles:



 
 
( 9 comments — Leave a comment )
sheehan on December 3rd, 2010 06:11 am (UTC)
Nice. I like the symmetry of the first.
motrismotris on December 3rd, 2010 04:02 pm (UTC)
*(in the solution? Not completely planned, but if you look at enough solutions of these on smallish grids you'll find that the stars often need to go in 2 or 3 spaces apart (not very spread at all) and small patterned regions happen all the time. I was pleasantly surprised to see I'd made the puzzle and everything worked out that way).
(Anonymous) on December 3rd, 2010 10:22 am (UTC)
Enjoyed. I particularly liked how the central areas in the 4J puzzle fit together to produce a couple of nice solving steps.
RV
thesubro on December 3rd, 2010 10:22 am (UTC)
Simple distractions ...
Not as complex or deep or long as you usually post, but enjoyable nonetheless.

Thanks.

TheSubro
motrismotris on December 3rd, 2010 04:04 pm (UTC)
Re: Simple distractions ...
Thanks. These were the first I've tried to make. While I know some harder Star Battle rules to put into these puzzles to up the difficulty, I wanted to start more simple and easy and see if I could just get puzzles with a good flow.
(Anonymous) on December 4th, 2010 06:56 pm (UTC)
Re: Simple distractions ...
I think you succeeded here - a fun couple of puzzles!

Tom.C
(Anonymous) on December 20th, 2010 03:01 pm (UTC)
Re: Simple distractions ...
Two fun puzzles indeed. I had tried only one star battle puzzle before, which I disliked. Apart from that, these were my first tries of solving star battle puzzles and they gave me lots of pleasure. Actually I was faster on the second one (3'52 vs 4'13) but I guess it is because I have learned a few tricks while solving the first.

Bastien
Samanthasammiantha on December 10th, 2010 01:41 pm (UTC)
Very satisfying to complete.

The first was a good warm up, and the second was challenging without being frustrating.
Teesside Snog Monster: puzzlejiggery_pokery on December 17th, 2010 09:21 pm (UTC)
FWIW, I could do the first of these, in about 5-10 minutes (though I wasn't really timing myself) at about the time you posted it. I'm 400-ish-rated at the moment but may make it to 700-ish in time. Thank you for making puzzles aimed at 700-ish solvers as well as at 1700-ish solvers from time to time.
( 9 comments — Leave a comment )