Slitherlink: Loop Logic Puzzle

Slitherlink (also known as Loop the Loop / Fences) is a classic Nikoli logic puzzle: draw one continuous loop around the number clues — no crosses, no branches.

2,000+ free puzzles. Daily challenge. Offline play. Built-in tutorial for beginners.

HOW IT WORKS
Each number tells you how many of that cell’s sides belong to the loop. Blank cells can be surrounded by any number of lines. Your finished path must be a single loop. The rules fit in a few sentences; the deductions can fill a commute.

WHY PLAY
• Same satisfying logic as Sudoku, different geometry
• Calm, focused gameplay without frantic timers
• Scales from tiny starter grids to huge daily boards
• Great for brain training, mindfulness, or a quick mental reset

FEATURES
• 2,000+ free levels across sizes and difficulties
• Daily challenge to keep you coming back
• Step-by-step tutorial and solving tips
• Free hints on your first puzzles
• Guide lines, auto marks, and error check tools
• Play fully offline
• Extra packs when you want more content
• Optional subscription to remove ads and unlock perks (cancel anytime)
• Leaderboards and progress sync on supported setups

GETTING STARTED
Begin with small boards. Mark empty sides around every 0, then watch neighboring clues force the next lines. When you’re ready, take on the daily challenge.

Recent changes:
Improvements and fixes