1. Open the Nonogram Picture Cross Puzzle Game on your mobile device.

2. Select a puzzle difficulty level: easy, medium, or hard.

3. Each puzzle consists of a grid with numbers displayed along the top and left sides.

4. These numbers indicate how many filled squares appear consecutively in that row or column.

5. Use logic and observation to determine which squares to fill based on the number clues.

6. Tap a square to fill it in if you believe it is part of the solution.

7. Tap again or use a different tool to mark a square with an X if you determine it should remain empty.

8. Carefully analyze the number sequences to avoid mistakes and solve the puzzle accurately.

9. Use the zoom-in function for larger grids to help view and place tiles more precisely.

10. Complete the puzzle by correctly filling in all necessary squares to reveal a hidden image.

11. Advance through increasing levels of difficulty as you solve more puzzles.

12. Use hints if you get stuck or want to verify your progress.

13. Try to complete each level with minimal errors for a higher score.

14. Enjoy the challenge of combining logic and visual imagination to unlock pixel art images.