Threadline: Flow Puzzle

500 elegant flow puzzles, each with exactly one solution. From 4×4 to 15×15. Daily challenges, smart hints, no time pressure. Free, offline-ready.

Connect, untangle, solve. 500 elegant flow puzzles in your pocket — from breezy 4×4 grids to mind-bending 15×15 challenges. Free to play, no Wi-Fi required.

Threadline is a relaxing brain-training puzzle game where you draw paths to connect matching colored nodes. Lines can't cross. Every level has exactly one solution — find the flow.

► 500 LEVELS, ONE SOLUTION EACH Every level from Easy through Godlike has been verified by an external SAT solver to have exactly one valid path layout. No guessing, no shortcuts — find the intended solution and the puzzle clicks.

► ELEVEN DIFFICULTY PACKS From a gentle Tutorial through Easy, Medium, Hard, Expert, Master, Insane, Nightmare, Legendary, Mythic, and Godlike. Each pack ramps up grid size, pair count, and wall density.

► DAILY CHALLENGE + STREAKS A new puzzle every single day. Build a streak. Compete with friends.

► SMART HINTS WHEN YOU'RE STUCK Out of ideas? Tap Hint — see one solved path for 5 seconds. Long enough to memorize, short enough to keep the satisfaction yours. Watch a quick ad for a free hint.

► SKIP TOKENS A level just won't click? Spend a Skip and move on. The next level unlocks — your stars stay honest.

► STAR RATINGS Every level scores 1–3 stars based on moves and time. Replay to chase 3-star runs across all 500 levels.

► GLOBAL LEADERBOARD Climb the Threadline ranks. Track total stars, levels completed, and points across the world.

► DARK, FOCUSED VISUALS A calm dark theme with vivid thread colors. No pop-ups, no clutter, no distractions — just you and the puzzle.

► OFFLINE-READY The full game works without internet. Play on flights, commutes, or anywhere quiet.

HOW TO PLAY

1. Tap a colored dot and drag to its matching pair.
2. Paths can't cross or overlap.
3. Paths can't grid-touch themselves — no doubling back next to your own line.
4. Use Undo, Hint, or Skip when you need a hand.

DIFFICULTY PACKS • Tutorial — 5 levels to learn the rules • Easy — 15 levels, 5×5 grids • Medium — 30 levels, 6–7 wide • Hard — 50 levels, more walls and pairs • Expert, Master, Insane — 60 levels each • Nightmare, Legendary — for serious puzzlers • Mythic, Godlike — only the brave finish 500/500

Perfect for fans of flow puzzles, untangle games, daily brain teasers, and zen logic challenges. No timers, no pressure — just satisfying flow.

Free to play with optional in-app purchases for hints, skips, and ad removal. Designed by JK Global Gaming.