Thu, 19 Sep 2024

Puzzle Books Make Great Gifts for Family and Friends (or Yourself!)

 Crossword a Day 2024 Wordsearch a Day 2024 Mixed Puzzles Book Junior Codes Book

The image to the right shows the start of a typical star battle puzzle. This one is a 10x10 puzzle, and requires you to place two stars in each row, column and bold-lined region in the grid. Stars are not allowed to touch, including diagonally. And with that deceptively simple rule set, the solver must work out where all the stars are to be placed in the grid.

Star battle is a delightful logic puzzle, and can come in a range of sizes. 9x9 is quite common, whilst the 10x10 puzzle is probably the most common size; easier puzzles are often 6x6 and contain 1 star to find, whilst at the 10x10 size several difficulty levels are possible, each with two stars to place in each of the thirty regions in the grid.

The solution to the puzzle given here is shown at the bottom of this page. There are various different solving rules that can be used to deduce where to place stars, and the more you solve, the more rules occur to you. As such this puzzle has a very nice solving experience, and the more you play the better you get at spotting potential ways of making progress and finding harder solve rules that can be used to do so.

One of the most important things to realise when solving star battles is that the 'no touch' rule means that any 2x2 block of cells can contain a maximum of one star. A good way to make solving progress is to look at the smaller regions in each grid, and seeing what can be placed as a result. For instance in the example above, in column three there is a region that contains just three cells. As we know that there can only be one star in any 2x2 set of cells, then we know there can't be a star in the middle of the three squares in that region as otherwise both neighbours would be blank and it would be impossible to place the two stars in that region. Therefore the first move when solving this puzzle would be to put an 'x' in that square (row four, column three) and since there are then two stars required in the region and only two empty squares, place the stars in the other two cells in that region. Furthermore, since that region of three squares is fully in column three, then once the stars are placed, the remaining squares in column three can have a 'x' put in them as placing the two stars in the region of three cells also places the two stars for that entire column.

Star battle puzzles make a nice addition to any puzzle page, being different of course to word puzzles and not requiring maths or the use of numbers in the grid as is the case with many logic puzzles.

Here is the solution to the sample puzzle above:

Puzzle Solutions
i Newspaper Solutions
Children's Puzzle Solutions

View a single page overview
List of puzzles

List of kids puzzles

View content such as dot to dots, adult colouring and more available to license for print right now

Word Puzzles
Children's Puzzles
Wordsearch
CodeWords
Arrow words
Kriss Kross
Word Wheel

Number & Colouring Puzzles
Children's Sudoku
Samurai Sudoku
Jigsaw Sudoku
Futoshiki
Mind Games
Killer Sudoku
Kakuro
Chess Puzzles
A - Z of Puzzles
Colour By Number
Dot To Dot

Puzzle Tools
Puzzle FAQ
Codeword Solver
Rhyming Dictionary
Puzzle Solving Tools
Solving Videos

Services
Puzzles for Apps
Article Writing
Themed Puzzle Pages