Fillomino▶Play

Pick a number from the pad under the board, then tap a cell to write it. Drag across several cells to fill a whole block in one stroke. The ⌫ key clears a cell you filled in yourself; the clues printed at the start are locked.

A block turns green the moment its size matches its number and red when it has grown past it, so you can see a mistake without counting. Finish when every cell is filled and no block is red.

Tips & strategy

Start with the biggest clues, not the smallest. A 5 needs four more cells around it, and on a 6×6 board there is usually only one shape that does not strangle its neighbours — so a large clue is far more constrained than it looks. A lone 1, by contrast, is already finished the moment you see it: every cell touching it must hold something other than 1.

The most useful habit is thinking about the cells a block cannot take. If an empty cell is surrounded by three finished blocks, whatever number goes there has to grow through the one remaining opening, which often forces its value outright. Likewise, a cell wedged in a corner with a single empty neighbour can only belong to a block of size 1 or 2.

Watch for the trap of two blocks of the same number ending up side by side. That is never legal here — if they touch they merge into one oversized block — so a finished 3 acts as a wall that keeps every neighbouring cell from being part of another 3. Experienced solvers use those walls as clues in their own right, marking off the border of a completed block before moving on.

Because the puzzle is generated with a solver that verifies a single solution, you never need to guess. If you find yourself picking between two options with no reason to prefer either, back up: there is a deduction elsewhere on the board you have not spotted yet, usually around whichever clue has the fewest ways left to grow.