fill

About This Game

Fill challenges you with the deceptively simple goal of covering an entire grid with a single continuous path. Starting from any cell, you must trace a route that visits every square exactly once — no revisiting, no gaps left behind. What sounds straightforward becomes a captivating logic puzzle as grid sizes grow and irregular shapes introduce dead ends that trap careless players. Each puzzle has a unique solution that requires methodical planning and spatial visualization to uncover. The clean geometric aesthetics and gentle color palette create a meditative puzzle experience that rewards patience over speed. This free browser game is the perfect companion for quiet moments when you want to exercise your brain without overwhelming stimulation.

How to Play fill

Each level presents a grid of connected squares. Some squares may be blocked or removed, creating irregular shapes. Choose any available square as your starting point by clicking or tapping on it. From there, move to adjacent squares horizontally or vertically — diagonal movement is not allowed. Each square you visit gets filled with color and cannot be visited again. Your goal is to fill every available square on the grid with your continuous path. If you reach a dead end with unvisited squares remaining, you must undo your moves or restart the level. The undo button at the bottom lets you step backward one square at a time, which is essential for correcting mistakes without restarting entirely. Smaller grids of four-by-four provide introductory puzzles where trial and error works reasonably well. Larger grids of eight-by-eight and beyond demand strategic thinking — you must plan several moves ahead to avoid trapping yourself in corners or isolated sections. Pay attention to squares with only one or two neighbors, as these must typically be visited first or last in your path. When the grid has an irregular shape with narrow corridors, those corridors usually dictate which direction your path must flow through them. Successfully filling the entire grid completes the level and unlocks the next one. Each puzzle set introduces new grid configurations to keep the challenge fresh across hundreds of levels.

Highlights

• Hundreds of grid puzzles with unique single-path solutions
• Progressive difficulty from small regular grids to large irregular shapes
• Clean geometric visuals with a calming color palette
• Undo system for step-by-step correction without full restarts
• No time pressure for a meditative puzzle-solving experience
• Free to play in any browser with no downloads needed

Tips & Tricks for fill

• Start from corner squares or cells with the fewest neighbors to avoid dead ends early
• Identify narrow one-cell-wide corridors first — they constrain your path direction through that area
• Plan three to four moves ahead rather than moving randomly and hoping for the best
• Use the undo button frequently instead of restarting when you get stuck near the end
• Look for squares that can only be reached from one direction — visit them at the right moment