Fill-a-Pix are exciting logic puzzles that form whimsical pixel-art pictures when solved. Challenging, deductive and artistic, this original Conceptis puzzle offers the ultimate mix of logic, art and fun while providing solvers with many hours of mentally stimulating entertainment.

Each puzzle consists of a grid containing clues in various places. The object is to reveal a hidden picture by painting the squares around each clue so that the number of painted squares, including the square with the clue, matches the value of the clue.

The game features a unique fingertip cursor which enables playing large puzzle grids with ease and precision: to fill a square, move cursor to the desired location and tap anywhere on the screen. To fill multiple squares, press and hold fingertip until cursor fills the square and start dragging to neighboring squares. The game also features a powerful Smart-fill cursor for quick, single-tap filling of all remaining empty squares around a clue.

For more fun, Conceptis Fill-a-Pix includes a Weekly Bonus section providing an extra free puzzle each week.


• 42 free Fill-a-Pix puzzle samples
• 8 extra-large puzzles bonus for iPad only
• Extra bonus puzzle published free each week
• Puzzle library continuously updates with new content
• Manually created by artists, top quality puzzles
• Unique solution for each puzzle
• Grid sizes up to 50x75 (65x100 for iPad)
• Multiple difficulty levels
• Hours of intellectual challenge and fun
• Sharpens logic and improves cognitive skills


• Exclusive fingertip cursor design for solving large puzzles
• Concurrently playing and saving multiple puzzles
• Puzzle library sorting and hiding options
• Portrait and landscape screen support (iPad only)
• Enlarge, reduce, move puzzle for easy viewing
• Smart-fill cursor for faster playing
• Unlimited Undo and Redo
• Auto-fill starting clues option
• Show errors during gameplay
• Check puzzle
• Track puzzle solving times


Fill-a-Pix have also become popular under other names such as Mosaic, Mosaik, Fill-In, Nurie-Puzzle and Japanese Puzzle. Similar to Picross, Nonogram and Griddlers, the puzzles are solved and the pictures revealed using logic alone. All puzzles in this app are produced by Conceptis Ltd. - the leading supplier of logic puzzles to printed and electronic gaming media all over the world. On average, more than 20 million Conceptis puzzles are solved each day in newspapers, magazines, books and online as well as on smartphones and tablets across the world.

What’s New

Version 5.1

This version improves performance and stability.

Ratings and Reviews

4.7 out of 5
213 Ratings
213 Ratings
hal0thane ,

Simple, but great

Whenever I want to play a game but I’m not in the mood to play something more involved, Fill-a-Pix is the perfect choice. With simple rules, a spartan but functional interface, and tons upon tons of downloadable (IAP) levels spanning everything from very small puzzles to massive iPad-only huge ones, very easy to impossibly hard, and across a wide range of topics, there’s enough here to keep me busy for years.

And years is how long I’ve been playing Fill-a-pix, in fact. I’m grateful that the developer continues to add new level packs even after all this time. The developer’s other number puzzle games are also well worth trying, though I keep coming back to Fill-a-pix time and time again.

Update: Still playing Fill-A-Pix regularly, all these years later. Nikoli, you really know how to deliver a number puzzle game that is simple yet engaging.

groksmith ,

Simple but satisfying

Love these puzzles. I used to get puzzles from their website before they converted many of them to iPad. This is one of the most successful. Simple idea but compelling and satisfying to complete. Highly recommend if you like logic puzzles.

UPDATE: Still playing, still enjoy. They’ve made some improvements to the interface but haven’t cluttered it up with bells and whistles that don’t add anything to the games. I have 6 or 7 Conceptis puzzles that I play almost daily. This is one of my top 2 faves. It engages my brain enough to scratch my puzzle itch, but I can do it even when I’m tired or distracted, at least with the basic level.

RKnopman ,

Relaxing and challenging

I've had this app for a couple weeks and am very much enjoying these puzzles. Really engaging, they make you think, and the easy logic puzzles are not frustrating.

A couple additional things would be nice. First, hints for learning the hard logic puzzles. Also, it would be nice if the extra puzzle packs were cheaper- I'd buy more of them.

— update (Feb 2019, probably 3 years later): I still enjoy this app as much as I did above- it's one of my all-time favorites. I've learned several additional strategies for solving the harder puzzle, though they're still very challenging.


Conceptis Ltd.
20.4 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese, Simplified Chinese

Age Rating
Rated 4+
© Conceptis Ltd.
In-App Purchases
  1. Basic Logic - Variety 1 $2.99
  2. Basic Logic - Variety Large $3.99
  3. Advanced Logic - Variety 1 $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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