Slitherlink vs Slitherlink

Slitherlink - The definitive logic puzzle experience for serious puzzle solvers. Based on the classic Nikoli puzzle, this app delivers a refined, performance-optimized implementation with intelligent puzzle generation and comprehensive progress tracking. Technical Features: • Algorithmically generated puzzles ensuring high-quality challenges • Three calibrated difficulty tiers: 5×5 (Easy), 7×7 (Medium), 10×10 (Hard) • Real-time conflict detection with visual feedback • Efficient undo system with 100-step history • Persistent state management with auto-save • Performance-optimized rendering for smooth 60fps gameplay Game Mechanics: • Three-state edge marking: line, cross, undecided • Loop validation: single continuous closed path verification • Clue satisfaction: numerical constraint checking • Best time tracking per difficulty level • Completion statistics and progress analytics Designed for players who appreciate mathematical logic, constraint satisfaction problems, and systematic problem-solving. Ideal for fans of Sudoku, Minesweeper, and other deductive reasoning puzzles. Elevate your puzzle-solving expertise.

Slitherlink, the classic logic puzzle — drawn like pen on paper. The rules are simple. Each number counts the lines surrounding its cell. Satisfy every number while drawing one single closed loop — no branches, no crossings — and the puzzle is complete. It looks easy, and then the logic gets delicious. Every puzzle has exactly one solution. Guessing is never required: every generated puzzle is mathematically verified to have a unique answer. Difficulty names mean something here, too — we measure the depth of reasoning each puzzle actually needs, and only serve ones that earn their label. ■ Features • New to Slitherlink? A hands-on tutorial teaches the rules on a tiny practice board • Four difficulties — from Easy 5×5 to Expert 12×12 • Daily Puzzle — the same board for everyone each day, with an attendance calendar and streaks • Paper-quiet design — an ink-and-paper ledger look, in light and dark • Comfortable controls — tap to draw, long-press to mark ×, drag along the dots • Room for big boards — pinch to zoom, two-finger pan, iPad and Apple Pencil support • Mistake-proof — unlimited undo/redo and automatic saving • Track your progress — best and average times per difficulty For the moments you want quiet focus, one board of Slitherlink is enough.