Your ten levels
Solve 3 different puzzles at a level to pass it. Each level has 12 progression puzzles plus practice boards. Premium opens every level straight away.
- 1 Introduction5×5; full lines Free
- 2 Beginner5×5; overlaps Pass 1
- 3 Developing8×8; single runs Pass 2
- 4 Intermediate10×10; multiple runs Pass 3
- 5 Advanced12×12; edge deductions Pass 4
- 6 Challenging15×15; chained inference Pass 5
- 7 Very hard20×20; sparse overlaps Pass 6
- 8 Expert20×20; contradiction deductions Pass 7
- 9 Master25×25; long constraints Pass 8
- 10 Grandmaster30×30; dense expert logic Pass 9
Rules
Goal: Fill exactly the cells described by the row and column clues.
- The numbers beside each row and above each column give the lengths of the filled runs, in order.
- Runs in the same line are separated by at least one empty cell. A row with no clue is empty.
- Every puzzle has one solution reachable by logic; no guessing is needed.
Controls
Click or tap to fill; right-click, long-press or X mode to mark a cell as empty. Drag to paint a line.
Stars
One star for a solve with hints, two for a solve without hints. Three stars: no hints and no wrongly filled cell. Stars and badges never depend on Premium.
Strategy guide
- Overlap
- In a 10-cell row with clue 7, the middle 4 cells must be filled however the run is placed.
- Edges
- A filled cell near an edge anchors the first run: count outward from it.
- Cross off
- Mark known-empty cells. They split lines into smaller pieces that are easier to solve.
- Contradiction
- Expert levels need “what if” thinking: if filling a cell makes some line impossible, that cell must be empty.