1. Open the game "Nonogram Picture Cross" on your mobile device.

2. Choose a puzzle level from the menu to begin playing.

3. Observe the grid of squares and the numbers located on the top of each column and the side of each row.

4. Each number indicates how many consecutive filled (colored) squares appear in that row or column.

5. Multiple numbers mean there are multiple groups, separated by at least one empty square.

6. Use logic to determine which squares to fill in and which to leave blank, based on the numbers provided.

7. Tap a square once to fill it in with color, indicating a part of the picture.

8. Tap a square twice to place an X, marking it as an empty square.

9. Continue using the clues from both rows and columns to fill in all correct squares and avoid mistakes.

10. Complete the puzzle by correctly filling all necessary squares and marking all empty ones.

11. Once the puzzle is solved, a hidden pixel art picture will be revealed.

12. Keep solving puzzles to improve your logic skills and unlock new images.