Noughts and Crosses Puzzle Rules
The rules of Noughts and Crosses Puzzles are as follows:
Here is an image of the start position of a noughts and crosses puzzle:
The first rule means that, for instance, on an 8x8 grid such as the puzzle shown here, there are four noughts (0) and four crosses (X) to be placed in each row and column of the grid. The second rule is fairly self-explanatory, and means that a run of 000 or XXX in consecutive squares is banned. The third rule is perhaps the hardest to grasp, but simply means that the makeup of each row is unique, and each column is unique. Thus if column one contains 0X0X0X0X then no other column can contain the same sequence.
If you'd like to see the rules explained using the sample grid above, then this video should prove of interest:
Play A Noughts and Crosses Puzzle
You may have come across this puzzle type under various names such as binary puzzle and kurosu; there are various other names too. However if you've not played it before, you might like to have a go at a puzzle with our Online Noughts and Crosses Puzzle Player
If you enjoy this puzzle type, you can join our online Puzzle Connoisseur's Club for £12 or $17 a year and play a new Noughts and Crosses Puzzle puzzle every day of the year, together with many other fun and interesting logic puzzles.
Noughts and Crosses Puzzle Solving Tips and Techniques
If you join our puzzle club above, you'll be able to play a new noughts and crosses puzzle every day of the year. None of the puzzles will ever require guessing or have multiple solutions, but you'll need to be good at spotting the patterns that will help you solve the puzzles. Here are some solving tips and techniques for you:
We can complete the row by placing 0s where the question marks are. That's because, on counting the number of each symbol in the region, we can see there are already four X's in the row. We know that is the maximum number allowed in a row in an 8x8 grid, and therefore the remaining blanks must contain 0s.