1. Open the "Reflection Symmetry" app on your mobile device to begin playing.

2. Select a level from the main menu. Levels increase in difficulty as you progress.

3. Observe the starting shape or pattern displayed on the screen.

4. Swipe your finger across the screen to draw a symmetry line. This line will act as the mirror axis for reflection.

5. Carefully position the symmetry line so that it reflects the given shapes or patterns accurately on the opposite side.

6. Once the symmetry line is placed, the game will automatically reflect the shape across the line.

7. Your goal is to fill the designated area by creating a perfect symmetrical reflection.

8. If the reflection fills the required area correctly, the level is completed successfully.

9. If the area is not completely or correctly filled, adjust your symmetry line by swiping again. You can retry as many times as needed.

10. As you advance through the game, new challenges and complex patterns will appear.

11. Use logic and spatial reasoning to determine the correct position of the symmetry line.

12. Continue completing levels to unlock new ones and improve your symmetry skills.

13. Enjoy stimulating your brain and mastering the art of reflection symmetry.