1. Open the game "Happy Halloween 2020 Puzzle" on your mobile device.

2. Choose one of the six available Halloween-themed images to begin your puzzle.

3. After selecting an image, pick your preferred difficulty level: choose between 16, 36, 64, or 100 puzzle pieces.

4. Once the puzzle loads, the pieces will appear scattered on your screen.

5. Drag and drop the pieces to their correct positions to start forming the complete image.

6. Use your finger to move the pieces around the screen. You can try placing corner and edge pieces first to build the frame.

7. Match colors, shapes, and patterns to guide you in completing the puzzle efficiently.

8. If needed, zoom in or out by pinching the screen to get a better view of the puzzle area.

9. There is no time limit, so take your time and enjoy solving each puzzle at your own pace.

10. Once all pieces are correctly placed, the puzzle will be completed, and you can view the full Halloween image.

11. Return to the main menu to select a new image or increase the difficulty level for more challenge.

12. Solve all six puzzles to keep your brain sharp and enjoy the festive Halloween spirit.