loopr: Yajilin Logic Puzzles

Shade cells. Draw a loop. Solve it with pure logic.

loopr is a loop puzzle where arrow clues tell you how many cells to shade, then you draw a single continuous path through everything that's left. If you love Slitherlink, Masyu, or any Nikoli puzzle, this is your next obsession.

Based on Yajilin — a classic Japanese grid puzzle originally published by Nikoli and featured in the World Puzzle Championship. Every puzzle has exactly one solution, discoverable through pure logic. No guessing required.

DAILY CHALLENGES

A fresh puzzle every day at three difficulty levels. Complete all three to keep your streak alive.

HUNDREDS OF PUZZLES

Easy, Medium, and Hard. Every puzzle is hand-crafted and solvable through logic alone.

THE GAUNTLET

A massive weekly puzzle that pushes your logic to the limit. One grid. One week. Good luck.

SMART HINTS

Stuck? Tap an arrow clue to reveal what should be there. No spoilers, no paywall.

STATS & STREAKS

Track your best times, daily streaks, and personal records. Badges and milestones mark your progress as you improve.

LEARN IN UNDER A MINUTE

Interactive tutorial and strategy guide get you solving quickly. If you've played Slitherlink or any loop puzzle, you'll pick this up fast.

ONE PURCHASE. NO ADS.

No ads between puzzles. No subscription. Pay once, play forever.

Clean, minimal design with a dark theme. Accessibility options including adjustable text size, high contrast mode, and reduced animations.

Perfect for fans of Slitherlink, Masyu, Sudoku, Nonograms, and other Nikoli logic puzzles.