# Killer Sudoku Pro

> Advanced Logic Puzzle Pro

Canonical page: [https://chrome-stats.com/d/id6770951811](https://chrome-stats.com/d/id6770951811)

## Overview

- **ID:** `id6770951811`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 晓 郭
- **Category:** Games
- **Version:** 1.0.0
- **Last updated:** 2026-05-20
- **First published:** 2026-05-20
- **Size:** 719 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/killer-sudoku-pro/id6770951811)
- **Privacy policy:** [https://adler0518.github.io/apps\_privacys/KillerSudoku-privacy.html](https://adler0518.github.io/apps_privacys/KillerSudoku-privacy.html)

## Description

Professional-grade Killer Sudoku with 3 difficulty tiers. Algorithmic puzzle generation ensures unique, solvable challenges every time.

Killer Sudoku represents the evolution of classic number puzzles. This implementation delivers a professional-grade experience with rigorous validation and optimized puzzle generation.

TECHNICAL SPECIFICATIONS:
• 9×9 grid with standard Sudoku constraints (row/column/box uniqueness)
• Cage partitioning algorithm generates 15-35 cages per puzzle
• Target sum constraints with intra-cage non-repetition rule
• Three calibrated difficulty tiers:
  - Easy: 1-3 cell cages, 12 given cells
  - Medium: 1-4 cell cages, 6 given cells
  - Hard: 1-5 cell cages, 0 given cells (pure deduction)

VALIDATION ENGINE:
Real-time conflict detection monitors:
• Row duplicates (horizontal constraint)
• Column duplicates (vertical constraint)
• Box duplicates (3×3 region constraint)
• Cage duplicates (intra-cage uniqueness)
• Cage sum overflow (partial sum exceeds target)
• Cage sum mismatch (completed cage sum ≠ target)

PERFORMANCE METRICS:
• Puzzle generation: under 2 seconds (optimized backtracking algorithm)
• Auto-save: 500ms debounced writes to UserDefaults
• Undo stack: 100-step history with O(1) rollback
• Timer resolution: 1-second precision with pause/resume

USER INTERFACE DESIGN:
• Dashed cage boundaries with 2pt inset rendering
• Head cell displays target sum (smallest index in cage)
• Cage completion state: green overlay for correct sums
• Related cell highlighting (same row/column/box)
• Cage highlighting (all cells in selected cage)
• Note mode: 3×3 candidate grid per cell

ALGORITHMIC GUARANTEES:
• Every puzzle has exactly one valid solution
• Cage partitioning ensures logical solvability
• No guesswork required—pure deductive reasoning

Optimized for iOS 16+. 100% offline operation. Zero network dependencies.

## Rankings

- #2,017,677 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6770951811)