Nonogram solver

Type the clue numbers for each row and column, one line at a time. Separate numbers with a space. Use a single 0 for an empty line. Row clues and column clues go in two separate boxes.

The solver marks each puzzle as line-solvable or not line-solvable. A line-solvable puzzle needs only row and column logic, with no guessing. The solver lists the techniques it used, such as simple boxes, forcing, or full line logic. The solver also shows if the solution is unique.

The solver accepts grids up to 30×30 cells and up to four colours. The solver checks for more than one solution with a backtracking search. This search does not explain each guess. Very large or dense grids can take longer to process.