Color Nonograms JCross is a fun puzzle game for Android that offers more than 25,000 free nonograms of various sizes, such as 10x10, 15x15, 20x20, 25x25, 30x30, etc. The game is designed to reveal hidden pictures as you color or leave blank cells in a grid according to the numbers at the side of the grid. All nonograms have their own single solution, making the game highly challenging yet entertaining.

The app is optimized to save your battery and comes with a zoom mode that allows you to solve even large nonograms. It supports portrait and landscape orientation and provides undo/redo support. Additionally, the app offers light and dark color schemes to suit your preference. For detailed instructions on solving nonograms, visit the developer's website.