Killer Sudoku - No Ads

40,000+ Killer Sudoku puzzles, daily challenges, and step-by-step logic hints. Learn killer techniques and drill them with focused practice—offline, anytime. Description Killer Sudoku — classic 9×9 Sudoku with cage sums for deeper logic. 【How to Play】 Fill 1–9 in every row, column, and box with no repeats. Dashed cages add two more rules: digits in a cage must add up to the corner total, and no digit may repeat inside a cage. Number placement plus summation makes every puzzle a richer solve. 【Huge Puzzle Library】 · Easy / Medium / Hard / Expert / Master — about 8,000 puzzles each · Daily Challenge with a calendar streak · Local library with progress and best times · Continue games; start sequentially or at random 【Learn Killer Techniques】 Built-in lessons from first fills to advanced killer logic: · Basics: Last Digits, Unique Cage Combinations, Innies & Outies (Rule of 45) · Intermediate: Working the Pairs, Few Cage Combinations, Cage Unit Overlap, Cage Splitting, Line/Unit Reduction · Advanced: Combo Exclusion, Cage Comparison, Rule of Parity Also includes a full classic Sudoku technique track—killer and standard logic in one app. 【Technique Practice】 Drill one skill at a time. Mark candidates red to eliminate and blue to place; match the target to clear the drill. Basic packs are free; intermediate and advanced packs unlock with Premium. 【Smart Hints】 When you’re stuck, get step-by-step reasoning with board highlights—why a digit belongs, or why a candidate must go—not just a reveal. 【Polished Controls】 Undo / redo, erase, notes, one-tap candidates, remaining-digit counts, timer, and error tracking. Auto-clear conflicting notes in the same row, column, box, and cage. Draw your own cages, set sums, solve with the built-in solver, and save up to 100 puzzles in My Library (iCloud sync). 【Premium】 One purchase, lifetime unlock: intermediate & advanced hint explanations, intermediate & advanced technique practice, and ongoing updates. Play offline. Think deeper. Open Killer Sudoku and master the cages.