What's the word for moving matches?

The first and second eight games erected at the bottom left move to the first number (3) and become 9 to the left. The second number has been changed to 9:

In the second step, the intermediate station used eight straight innings, leaving the third zero number below to move horizontally to the fourth place. As the fourth number turns to 8, everywhere becomes the third number 9, and the correct answer is 9998.