How to play
The numbers beside each row and above each column tell you how many filled squares are in that line, in order. “3 1” means a run of three filled squares, at least one gap, then a single filled square. Use the clues together to work out which squares must be filled and which must stay empty. When every line matches its clue, the hidden pixel picture appears in full color. Every puzzle here, including the random ones, has exactly one answer that you can reach step by step without guessing.
Controls
Tap or click a square to fill it, and drag to paint a straight line in one go. Switch to “Mark empty” (or right-click) to place an ✕ on squares you know are blank — it keeps your reasoning visible. Dragging from a filled square erases instead. Undo has no limit. On a keyboard, move with the arrow keys, press Space to fill and X to mark empty. A row or column clue turns grey once that line matches. Turn on “Show mistakes as I go” if you would like each wrong square pointed out and counted; leave it off for the classic way of playing.
Tips
Start with big numbers: in a 10-square line, a run of 7 must cover the middle 4 squares wherever it sits. Lines with a 0 or a sum that fills the whole line are free points. Then look for runs pressed against an edge or an ✕, and keep marking squares you have ruled out. Your progress, solved pictures and best times are saved in this browser, so you can stop anytime and come back later.