Killer Sudoku is a free, offline, and fully-featured logical reasoning number puzzle game that is perfect for anyone who loves classic Sudoku or is looking for a challenging maths puzzle. The game combines elements of Sudoku, Sumdoku, Kenken, Addoku, Kakuro, etc., and offers 10,000+ Killer Sudoku puzzles with 4 difficulty levels ranging from Easy to Extreme.

The objective of the game is to fill all rows, columns, and 3x3 blocks with numbers 1-9, ensuring the sum of numbers in each cage is equal to the number in the upper left corner of the cage. The sum of all numbers in each 3x3 block, row, or column always equals 45, and numbers cannot repeat within cages, a single row, column, or 3x3 region.

Killer Sudoku has an intuitive interface, easy control, clear layout, and well-balanced difficulty levels for novice and advanced players. The app also offers daily challenges, tracker, auto-solver, notes, eraser, unlimited undo option, achievements and leaderboards, statistics, multiple different themes and helper features. Enjoy the game and improve your logical reasoning and memory skills.