How to play
Drag from a numbered cell to its matching pair to draw the path. Paths cannot cross or overlap each other. Every cell must be filled. Tap to clear a path and retry. Daily puzzle gives every player the same board.
Game features
- One hundred-and-fifty levels across four grid sizes (5x5 to 11x11)
- Daily puzzle with shared leaderboard
- Touch drag-to-route input
- Mouse and keyboard inputs also supported
- Local best-time tracking per level
- No microtransactions
Editor review
Number Flow is a logic puzzle where you route numbered paths through a grid so that each pair of matching numbers is connected. The format is a digital implementation of Numberlink (newspaper puzzle, ~1990s) and the digital implementation respects the format's strengths.
What works is the no-overlap constraint. Paths cannot cross or overlap, which forces tight routing decisions. Combined with the requirement to fill every cell, the puzzle becomes a constraint satisfaction problem with a unique solution per level. The deterministic nature is what separates this from sloppy routing puzzles.
One hundred-and-fifty levels arranged in four grid sizes (5x5, 7x7, 9x9, 11x11). The small grids are introductory and solve in under a minute each. The medium grids (7x7) are the sweet spot for commute play. The 9x9 grid starts requiring deduction beyond brute-force tracing, and the 11x11 grid is for dedicated solvers, with most levels taking me ten to twenty minutes each.
Tested on phone (the obvious fit for this format) plus laptop. Touch with drag-to-route works beautifully. Mouse-drag works equally well. Keyboard with arrow-key tracing is also supported but slower than the drag inputs.
Where the design earns its four stars is the daily puzzle mode, where every player gets the same puzzle and times are compared on a leaderboard. The daily-puzzle pattern is the right retention loop for this format because it creates social-comparison stakes without intrusive monetisation.
Where I would push back is the absence of variable grid shapes. All puzzles are square grids. Numberlink puzzles in the real world sometimes use rectangular or irregular grids, and that variety would add to the format. The square-grid-only choice feels conservative.
Four stars. Strong digital Numberlink with daily-puzzle retention loop and a wide difficulty range. Recommended for logic-puzzle players who appreciate constraint-satisfaction problems.
Physics graduate who works in cybersecurity by day and reviews browser puzzles by night. The kid who solved Rubiks Cubes at lunch in school. Has opinions about constraint-satisfaction algorithms.
Frequently asked questions about Number Flow
How do I play Number Flow?
Drag from a numbered cell to its matching pair to draw the path. Paths cannot cross or overlap each other. Every cell must be filled. Tap to clear a path and retry. Daily puzzle gives every player the same board.
Is Number Flow free to play in my browser?
Yes. Number Flow runs free in any modern browser. No installation, no signup, no payment required. Click the play button to load the game.
Does Number Flow work on mobile devices?
Number Flow runs in mobile browsers on iOS and Android with touch controls. Most puzzle games on AJ Arcade support both desktop and mobile, though precision-heavy titles tend to play better on desktop with a keyboard or gamepad.
Who reviewed Number Flow on AJ Arcade?
Asha Khan reviewed Number Flow. Their full editor review appears above and their other coverage is available on their author profile.
Where can I find more games like Number Flow?
More puzzle titles are available on the Puzzle category page. Every game on AJ Arcade has been played and reviewed by one of our three reviewers before publication.