SpaceBots Match vs Killer Sudoku Pro

It's a Match! Tap a SpaceBot, then tap the same colour to make them both disappear - you will then be left with one unique colour SpaceBot, touch this last to clear the board! 3 exciting modes to take on! Endless Mode - An endurance test! with 3 seconds per board, how long will you last? 1 Minute Mode - It's a race against the clock! How many boards can you clear in 60 seconds? Time Attack Mode - A vigorous test of reflexes! How fast can you clear just one board? Compare your impressive scores with your friends or people around the world via the online leaderboards. Will you be the top matcher?

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.