《一筆畫》是經典數學謎題「歐拉路徑」的趣味重現，玩法簡單卻充滿策略性：畫面中央是由彩色圓點與線條組成的圖形，玩家只需用手指（或滑鼠）從任意一個點出發，沿著已有的連線滑動，目標是在不重複描繪同一條線、且手指不離開螢幕的情況下，一筆畫完所有的連線。
遊戲共設計了 100 個精心編排的關卡，難度從新手友善的簡單圖形，逐步進化到節點交錯、線路複雜的高難度挑戰，每一關都保證有解，絕不會讓你卡在無法完成的死局裡。完成上一關才能解鎖下一關，穩扎穩打逐步提升你的解謎技巧。
每個關卡都加入了限時挑戰模式：用時越短，獲得的星星越多（最高三星）！想要拿到滿星評價，不僅要找對路徑，還要眼疾手快。如果一時想不出思路，可以使用「提示」功能，觀看一段短片即可獲得關鍵提示，助你突破難關。
遊戲畫面採用溫馨可愛的手繪風插畫風格，搭配輕快的背景音樂與清脆的音效，無論音樂或音效都可以隨時在設定中關閉，安靜燒腦也沒問題。介面採用全螢幕自適應設計，無論手機、平板，橫屏豎屏都能完美呈現，隨時隨地都能輕鬆上手。
不需要下載安裝，打開瀏覽器即可開始挑戰。無論是想消磨零碎時間，還是想認真鍛鍊邏輯思維，《一筆畫》都是你不可錯過的休閒益智好遊戲！
One Line Drawing is a playful take on the classic mathematical puzzle known as the "Eulerian path." The rules are simple yet deeply strategic: a network of colorful dots and connecting lines fills the board, and your job is to start from any dot and trace a continuous path along the existing lines — covering every single line exactly once, without lifting your finger from the screen and without drawing any line twice.
The game features 100 carefully crafted levels, progressing from beginner-friendly shapes to dense, crisscrossing networks that will truly test your spatial reasoning and planning skills. Every level is guaranteed to have a valid solution, so you'll never be stuck on an impossible puzzle. Levels unlock sequentially, letting you build your skills step by step as the challenge grows.
Each level also includes a timed scoring mode — the faster you complete the puzzle, the more stars you earn, up to a maximum of three. Chasing a perfect score means not only finding the right path but also moving quickly and confidently. Stuck on a tricky layout? Use the in-game hint feature: watch a short video to reveal the next correct move and get back on track.
Wrapped in a charming, hand-drawn art style with cheerful background music and crisp sound effects, the game lets you toggle music and sound independently at any time for a quieter play session. The fully responsive, full-screen interface adapts seamlessly to any device and orientation — phone or tablet, portrait or landscape — so you can jump in and play anywhere, anytime.
No download required — just open your browser and start tracing. Whether you're filling a few spare minutes or looking for a genuine logic workout, One Line Drawing is a casual puzzle game you won't want to miss!