The hard packs
| Board | Levels | Colors | Cells per color (avg.) |
|---|---|---|---|
| 10×10 | 211–280 | 9–13 | 8–11 |
| 11×11 | 281–360 | 10–14 | 9–12 |
| 12×12 | 361–450 | 11–15 | 10–13 |
| 13×13 | 451–550 | 12–16 | 11–14 |
| 14×14 | 551–660 | 13–16 | 12–15 |
| 15×15 endless | 661+ | 13–16 | 14–17 |
Average line length is what you feel: on the last boards a single color can wind through 30 or more cells.
What changes on big boards
- Regions. The board splits into areas separated by the first lines you draw. Each region must be fillable by the colors that still have to pass through it; if a region is sealed off with no color inside, something earlier is wrong.
- Parity. A line enters a region and leaves it; count the cells and the entrances. Odd leftovers mean a line has to wiggle, not cut straight.
- One long filler color. Most big boards have one or two colors whose dots are far apart. They go last and absorb whatever space remains.
Expert routine
- Scan the border and draw every edge line that is forced.
- Resolve the corners.
- Draw the short lines near their dots when their route is unique.
- Fill region by region, keeping the long color for the end.
- If the fill counter stalls below 100 %, find the empty pocket and bend the nearest line, rather than restarting.
More patterns on the tips page.
Endless mode
After level 660 the game keeps generating 15×15 boards with 13–16 colors, each from a fixed seed, so level 700 is the same for everyone and your star for it is kept. There is no last level; the level grid shows more buttons as you go.
FAQ
What is the hardest level?
Difficulty depends on the layout, not only the size, but 14×14 boards with 13 colors (the end of the 551–660 pack) have the longest lines. Endless 15×15 boards are a step above.
Can I jump straight to 14×14?
Yes. The first level of every pack is open; go to level 551. Within the pack you then unlock levels one by one.
Do big boards have a unique solution?
Not always. Any layout that links every pair and fills every cell is accepted, so you do not have to match the built-in one.
How long does a 14×14 take?
Experienced players need a few minutes; the first ones can take much longer. There is no timer.

Tips & strategysolve flow puzzles faster
Levels & difficulty4×4 to 14×14 and endless
Daily puzzleone new board every day
Flow puzzle onlinelink colors, fill the board