OnelineDraw a protective single-line barrier to shield an oblivious character from falling hazards in One Line, playable free in your web browser.
Oneline
What is One Line?
One Line is a physics-based puzzle game developed by playablefactory where you protect an oblivious character from sudden hazards by drawing a single continuous barrier. Each stage places the figure beneath impending dangers such as falling boulders, attacking bees, incoming bullets, or heavy rain. Your drawn structure drops under the rules of gravity the moment you lift your input, needing to shield the target for 3 seconds to win. The game runs directly in your web browser with no download or setup required.
Key features
- Single-stroke drawing: Create an entire defensive shelter or ramp using only one unbroken line per attempt.
- Real physics simulation: Drawn objects carry physical weight and respond to gravity, resting on ledges or tumbling when unbalanced.
- Three-second countdown: Every completed drawing must withstand impacts and preserve the character for 3 seconds to clear the puzzle.
- Variable solutions: Puzzles do not require a single fixed answer, leaving room for different protective shapes and structural layouts.
- Assistance options: Players can inspect an outlined dotted guide with hints, clear mistakes using an eraser, or expand stroke length with Line 2X.
- Line customization: Unlock fresh colors and patterned skins through the in-game cosmetic shop.
How to play
- Examine the stage to spot the position of the character and where incoming hazards like boulders or bees will strike.
- Locate solid platforms, walls, or ground surfaces that can support and anchor your upcoming shape.
- Click and drag your mouse pointer or slide your finger across the display to trace one continuous barrier.
- Release your input to finalize the stroke and let gravity take effect on the new physical barrier.
- Survive without the character taking damage until the 3 seconds timer counts down completely.
- Retry immediately for another attempt if the barrier slides away or allows hazards through.
Controls
| Action | Mouse | Touch |
|---|---|---|
| Trace protective line | Hold left click and drag cursor | Press and drag finger |
| Drop drawn structure | Release left click | Lift finger |
| Select shop and hint tools | Click interface icon | Tap interface icon |
Gravity and structural balance
Because drawn strokes turn into solid physical bodies the moment they are completed, balance is crucial to surviving each hazard. A shape drawn without grounding will tumble sideways or slide off the character when struck by falling objects. Connecting the ends of your line around corners or resting the base against nearby walls provides solid bracing against heavy impacts.
Compact drawings consistently perform better than large, sweeping outlines. Excessively wide enclosures add unnecessary weight and create long levers that easily flip when pushed by swarming bees or falling debris. Keeping the barrier tight around the character keeps the center of mass stable and prevents unintended gaps.
Tips and strategy
- Hook lines around edges: Curving your stroke around level platforms hooks the shape into place so incoming rocks cannot knock it away.
- Keep the profile small: Tighter shapes minimize the surface area exposed to bees and reduce the risk of structural collapse under gravity.
- Slant roofs against falling threats: Angled tops guide boulders and rainfall away from the character rather than absorbing the direct weight overhead.
- Wedge barriers between walls: Jamming both ends of your line into narrow gaps locks the structure firmly without requiring lower supports.
- Consult the dotted guide: If a puzzle layout seems impossible, activating the hint reveals the recommended line outline directly on the screen.
Similar games
- Heart Box: A physics puzzle game about guiding an experimental robot through testing rooms by manipulating environmental obstacles.
- Math Duck: A puzzle platformer where you calculate quick arithmetic equations to unlock exits before the timer expires.
- Slice Master: A precision timing game where you flip a blade through various targets and tricky obstacles.
Developer and history
One Line was developed by playablefactory and launched in September 2022. The puzzle title was built to offer quick physics-based problem solving that runs smoothly across desktop and mobile web browsers.