Daily Killer Sudoku

Welcome to Daily Killer Sudoku!

Daily Killer Sudoku is an exciting and challenging variant of the classic Sudoku puzzle. In this brain-teasing game, you'll not only need to follow traditional Sudoku rules by filling a 9x9 grid with numbers 1-9 in each row, column, and 3x3 box, but you'll also need to solve additional sum constraints in specially marked regions called 'cages'. With a fresh puzzle available every day, Daily Killer Sudoku offers the perfect blend of mathematical calculation and logical deduction for puzzle enthusiasts looking for an extra challenge!

Game Features

A new challenging Killer Sudoku puzzle every day
Classic 9x9 grid with standard Sudoku rules
Additional 'cage' regions with sum constraints for extra challenge
Multiple difficulty levels from beginner to expert
Helpful hints and note-taking system to assist your solving strategy
Error checking to help you learn and improve
Timer to track your solving speed and progress
Clean, user-friendly interface optimized for both desktop and mobile play
Save and resume functionality to continue your puzzle later

How to Play

Examine the 9x9 grid with dotted 'cage' regions and their sum clues
Each row, column, and 3x3 box must contain the numbers 1-9 without repetition (standard Sudoku rules)
Additionally, the numbers in each dotted 'cage' must add up to the small number shown in the corner of that cage
Numbers cannot repeat within a cage
Use logic to determine which numbers can go in each empty cell
Click on an empty cell and enter a number
Use the notes feature to keep track of possible numbers for difficult cells
Continue filling in numbers using logical deduction and mathematical calculation
Complete the entire grid following both Sudoku rules and cage sum constraints to win

Tips for Success

• Start with small cages - especially those with high or low sums that have limited possible combinations

• Learn common cage combinations - for example, a cage of 3 cells summing to 6 can only be 1+2+3

• Use the intersection of cage constraints with row, column, and box constraints

• Look for cells that belong to multiple cages - these are highly constrained

• When you place a number, update your notes in all affected rows, columns, boxes, and cages

• For difficult puzzles, try the 'what if' approach - test a number and see if it leads to a contradiction

• Practice regularly to recognize patterns and improve your solving speed

• Don't forget that standard Sudoku techniques still apply alongside the cage sum constraints