Fillomino
Puzzle · 1 playFillomino
Fill the grid with numbers so it splits into regions — a region of N cells holds only the number N.
About Fillomino
A gentle, absorbing number puzzle from the Japanese puzzle tradition. Write a number in every empty cell so the grid breaks into regions: touching cells with the same number form one region, and a region of size N must be exactly N cells, every one showing N — a 3 is a group of three 3s, and a 1 stands alone. Two regions of the same size may never touch side by side, or they would merge into one that is too big. Bold clues get you started, and a region may hold several clues or none at all. Every puzzle is freshly generated with exactly one solution, on a 6×6 Easy, 8×8 Medium or 10×10 Hard grid. Tap a cell and a number, or drag a number into neighbouring cells to paint a region in one stroke. Finished regions light up in colour, and a hint is there if you need one. Free to play in your browser — no download, no sign-up.
How to Play
Write a number 1–9 in every empty cell. Touching cells with the same number form one region. A region of size N holds exactly N cells, all showing N. Same-size regions may never touch side by side. Tap a cell, then a number — or drag from a number to paint neighbouring cells. Hints fix a mistake or reveal a cell (+20s). Faster solves score more.
Tips & Strategy
Begin with the regions that are already decided. Any 1 stands alone, so cross off its neighbours in your mind: none of them can be a 1. A clue whose number matches the size of the space around it — a 2 with only one open neighbour, a 3 tucked into a corner with exactly two cells beside it — can be finished straight away. Big clues in tight spots are just as useful, because a large number has to escape through whatever narrow gaps it has.
Remember the no-touching rule. Two different regions of the same size may never touch side by side, so when a finished 3-region sits next to an empty cell, that cell cannot be a 3. That simple fact often pins down an empty cell between two finished regions to the only size left. Clues of the same number near each other are worth a long look too: they may belong to one region, or to two separate regions that must be kept apart.
Work on the empty spaces as well as the clues. A pocket of empty cells cut off from every clue still has to be filled, and its size is a strong hint — two empty cells walled in by finished regions can only be a 2, since two 1s side by side would merge. Drag to paint a number across several cells at once; finished regions light up in colour, and a striped red region tells you it is too big or walled in before it can reach its size. Hints fix a mistake or reveal a cell for 20 seconds each, and the quickest solves score the most.