How can a two-person friend pass invite friends to several people？

There is no limit to the number of people who can get a two-person friend pass. See below for details.

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First, there is no limit to the number of people who can pass for two friends.

Second, the friend pass is equivalent to a free experience version.

If a friend of the official version invites you, you can play all the contents of the game in the experience version. For example, your friend bought an ontology, and then you can get a friend pass, and then he can invite you to play games in the ontology, and then you can enter the pass version to play with him.

Third, how to get a friend pass?

Search on STEAM for a double trip, and you can see a game called "It Takes Two Friend’s Pass". This is a pass, and then it is a demo version. You can play the first chapter for free, and more importantly, you can play online games. As long as your friends (who need friends to buy ontology) invite you, you can experience all the chapters for free.