Puzzle · Logic Puzzle
Fillomino
Play Fillomino online. Fill every cell with its region size. Equal numbers must form connected regions of exactly that many squares.
The game's own interface may still be in English.
Overview
Fillomino turns a sparse set of numerical clues into a complete map of regions. Every square receives a number, and that number is the size of the connected region containing the square. A region of four therefore consists of four edge-connected squares, each containing a four. Regions with equal values cannot touch along an edge, because they would merge into a larger region of the wrong size. Different-sized regions may share a border freely. The starting numbers constrain the final arrangement, but the supplied clues do not necessarily label every eventual region. The Filling implementation lets you work through these deductions without a countdown, choosing new boards and dimensions from the game menu when you want another challenge.
How to Play
Select a square and enter its region size using the keyboard or the on-screen number buttons. The input fills a cell rather than drawing a region border directly. Use the arrow buttons to move the selection and Backspace to clear a tentative value. Group neighbouring cells with the same value until their connected area matches that value. The small starting boards are suitable for single-digit input. If a region becomes too large, use Undo or erase its uncertain cells. Restart restores the given clues.
Tips & Strategy
A one is already a complete region, so none of its edge neighbours can be another one. Extend a nearly full region only into cells that will not accidentally join another region of the same size. Count available space as well as placed squares: a five trapped in a four-cell pocket proves that an earlier boundary assumption is wrong. When two identical clues are close together, consider whether they must belong to the same region or need a separating strip of different values. Finish forced small regions before guessing the outline of a large, flexible region.
About this version
Fillomino uses the locally compiled filling engine from Simon Tatham’s Portable Puzzle Collection. The original authors retain credit under the MIT license. SonoTap provides the browser adaptation and this guide.
Controls
- Keyboard
- 1–9 — enter a value in the selected cellArrow keys — move the selectionBackspace — erase an entry
- Mouse
- Select a square and enter its region size using the keyboard or the on-screen number buttons. The input fills a cell rather than drawing a region border directly. Use the arrow buttons to move the selection and Backspace to clear a tentative value. Group neighbouring cells with the same value until their connected area matches that value. The small starting boards are suitable for single-digit input. If a region becomes too large, use Undo or erase its uncertain cells. Restart restores the given clues.
- Touch
- Tap or drag on the board using the same rules as mouse input. Enable Secondary for the alternate mark; numeric games also provide on-screen keys.
Features
- Fill every cell with its region size. Equal numbers must form connected regions of exactly that many squares.
- Local open-source game engine with original author credits
- Generated puzzles and the upstream Type settings
- Undo and restart controls
- Touch input and a secondary-action toggle
Frequently asked questions
What is the goal in Fillomino?
Fill every cell with its region size. Equal numbers must form connected regions of exactly that many squares.
What is a useful first deduction in Fillomino?
A one is already a complete region, so none of its edge neighbours can be another one. Extend a nearly full region only into cells that will not accidentally join another region of the same size.