Fill One Line
Connect the Dots, Solve the Puzzle!
Fill the board with just one line. Easy to learn, hard to master!
Why You'll Love It
Boost Your Brain
Improve logic, concentration and problem-solving skills.
Challenging & Addictive
Hundreds of unique levels that keep you hooked.
Daily Rewards
Complete daily challenges and earn amazing rewards.
Play Anywhere
No internet? No problem! Enjoy offline anytime, anywhere.
Frequently Asked Questions
Find answers to common questions about Fill One Line.
You need to connect all the circular nodes on the grid using a single continuous stroke. You cannot lift your finger or cross over any line you have already drawn.
You can tap the "Restart" button to reset the current level without penalty, or use a "Hint" (💡) which will automatically draw the next correct segment of the path for you.
No, there are no timers. You can take your time, think through the grid structure, and solve the puzzles at your own pace.
We feature hundreds of unique and challenging levels, ranging from basic 3x3 shapes to complex geometric configurations and large multi-node maps.