How to get the blue routing relay code

In the "Blue Route" game, players can get the serial number by inviting friends or participating in some activities in the game. The specific way is as follows:

1. Invite friends: Click "Introduction Code" in the game, then select "Invite friends", fill in the friend's "account ID" and "nickname" and send an invitation. If your friend registers the game through your invitation and reaches a certain level, you can get the relay code.

2. Participate in activities: Some activities are often held in games, and some activities can be rewarded with reference codes. The rewards and participation methods of these activities will be explained in the in-game announcement, and players can complete the corresponding tasks according to the prompts and get the relay code.