The second 6 means six 100.

The third 6 means six 10.

The fourth 6 means six 1.

In addition:

6666

It is a homonym of "Liu", which first appeared in the spoken language of competitive games such as League of Legends, meaning to play well Liu (homophonic), and often appears in the dialogue between gamers. It also contains irony,

Example: blind people insert wq, R flashes, followed by two Q's, 66666!

Comments: In the game, "6666" can be both positive and negative. Praise is to praise others for playing well. The derogatory term is used when people are embarrassed. The specific method is to enter "6666" in the dialog box first, and then enter a string of "2333".