It requires you to use logic and numeric hints to deduce the pixel art.
iPACROSS Free features 80 free puzzles and 320 more available for purchase. It also includes the innovative multiplayer mode for free.
iPACROSS Free is a puzzle game known by many other names, including Paint by Numbers, Logic Puzzle, Griddlers, Nonogrames or Picross. The game exploits concepts similar to Sudoku, but rather than focusing solely on numbers, iPACROSS Free requires you to use logic and numeric hints to deduce the pixel art hidden in the game board.