Picture logic puzzles on squared paper, also called Japanese crosswords or hanjie. The numbers beside each row and above each column tell you how many cells are shaded in there, and in what groups. Shade the right ones and a picture appears. Free in your browser, alone or racing a friend.
A nonogram is a grid with a clue for every row and every column. “3 1” means a group of three shaded cells, then at least one blank, then a single one, in that order. There is nothing else to go on: no letters, no maths, only the clues and what they rule out in each other.
Every puzzle here is dealt fresh and checked before you see it: it has exactly one answer, and you can always find the next cell by reasoning, one line at a time, without guessing. Pick a size to start:
How to read the clues, shade cells and cross them out, and what counts as solved.
Read the rules →The handful of techniques that solve every puzzle here, from the overlap of a long group to working from the edges.
How to solve nonograms →Racing a friend, you both get the same puzzle at the same moment, each on your own sheet. Solve it first and you win. You see how many of their lines are done, never which cells they shaded.