Fill

📋 Game Profile

Item	Details
Game Title	Fill (One Line Puzzle)
Platform	H5 / Web Browser (Instant Play)
Genre	Puzzle / Logic / Pathfinding
Core Mechanics	One-line Drawing, Grid Filling, No Backtracking
Target Audience	Logic puzzle fans, Perfectionists, Brain trainers
Distribution	Free-to-play Web Game

📝 Game Description

"Fill" is a geometric filling game that tests your logical thinking. The interface consists of grids in various irregular shapes. Your mission is crystal clear: fill every single empty square in the grid using one continuous line. There are no time limits, no enemies chasing you—just you and a geometric puzzle waiting to be solved. With its vibrant colors and minimalist style, it is the perfect game for quiet contemplation or killing time during a commute.

🕹️ Gameplay Mechanics

The game follows the classic "One Line" rules, optimized for touchscreens and mice:

1. Start & End: Usually, a starting block is designated (or you pick the first one). You must begin your journey there.
2. Movement Rules: You can swipe Up, Down, Left, or Right. As you move, a colored line trails behind you, filling the blocks you pass through.
3. The Constraint: You cannot backtrack or cross your own line. You must plan a perfect path that visits every empty square exactly once. If you hit a dead end with empty squares remaining, you fail and must reset.
4. Progression: Early levels are simple rectangles or squares. Later levels introduce complex, odd-shaped maps and sometimes obstacles (walls), significantly increasing the difficulty of pathfinding.

💡 Strategy Guide

• Spot the Dead Ends: This is the most crucial tip. Look at the map; if a square has only one way in or out (like a protruding single block), that block must be either the start or the end of your line. If the start is fixed, that block is definitely the end, which dictates your path direction.
• Avoid Islands: When planning your route, never split the remaining empty area into two disconnected sections. Since you only have one continuous line, if you split the map, you can only fill one section, leaving the other unreachable.
• Reverse Engineering: If you are stuck moving forward from the start, try thinking backwards from the likely endpoint. Sometimes, tracing the path in reverse reveals the solution instantly.
• Trial and Error: Since the restart cost is zero, don't just stare at the screen. Move your finger and try a path. Often, the solution reveals itself through the process of elimination.

🏆 Editor's Choice

As an editor, I recommend "Fill" because it acts as pure yoga for the brain. In a gaming world full of complex mechanics and microtransactions, "Fill" returns to the essence of gaming—solving puzzles. The satisfaction of deducing the correct path and watching the entire pattern fill with color in one smooth motion provides an immense sense of completion. It is excellent for training spatial reasoning and is suitable for players of all ages.