Nonograms,
numbers into pictures.

Nonograms — also known as Picross, Griddlers, or Hanjie — is a picture-logic puzzle. The numbers along each row and column tell you the lengths of consecutive filled blocks in that line, in order, with at least one empty cell between blocks. Solve every line at once and a pixel picture emerges.

Use the row and column clues to deduce which cells must be filled and which must be empty. Click an empty cell to fill it. Switch to cross mode to mark cells you know are empty — crosses are personal notes that help you keep track. You win when every filled cell matches the hidden solution.

A row labelled "3 2" means: somewhere in that row there are three filled cells in a row, then at least one empty cell, then two filled cells in a row. A clue of "0" means the whole line is empty. Clues never tell you exactly where the blocks start — that is the puzzle.

Cross mode lets you mark cells that you have deduced must be empty. Crosses do not affect the win condition — they are notes. On a desktop you can also right-click any cell to drop a cross without switching modes. The shared shortcut key is X.

When you fill a cell that should be empty, the mistake counter increases by one. The cell stays filled — the puzzle does not auto-correct — but you will not be able to finish until every filled cell matches the solution. Erase the wrong cell by clicking it again or by switching to cross mode.

Easy is a 5×5 grid for a quick warm-up. Medium is a classic 10×10 board. Hard is a 15×15 board with deeper deductions and longer clues. The grid scales responsively on every level so puzzles stay readable on phones and tablets.

Start with the longest clues — a clue of N on an N-wide line fills the whole line; on a 10-wide line a clue of 8 forces a six-cell middle overlap. Cross out cells that cannot belong to any clue, then re-scan rows and columns. Most puzzles solve through repeated row/column passes, not guessing.

Yes. The board scales for small screens and supports tap-to-fill plus drag-to-paint, so you can stripe in long blocks quickly. Long press is not required — switch the global mark mode in the toolbar and tap normally.

The timer is for personal pacing only. It tracks how long the current puzzle has been open and never times you out. Take as long as you need — the satisfaction is in the deduction.