About the game
Nonogram turns a grid of blank squares into a pixel picture, and the only hints are numbers along the top and left edges. Each number counts a run of filled squares in that row or column. Two numbers mean two separate runs, with at least one empty square between them, so a clue of 3 1 asks for three filled squares, a gap, then one more.
You pick a difficulty and work through the picture puzzles in the collection. Fill only the squares the clues prove, then check a row against its column to confirm. Easy grids finish fast; bigger ones reward patience. No guessing is needed anywhere, and a short break is enough for one puzzle.