Board Thread:General Discussion/@comment-80.0.75.181-20140530214828/@comment-24088226-20140530231348

Presents -> Invite Code tab. Invite code tab doesn't appear for iOS users, though you can still get other players to put your code in (invite code is just your user ID). You can only put in someone else's code for a card once, for all the other cards you have to get other players to enter in your code.

1st card for putting in someone elses code

2nd card 1 other person putting in your code

3rd card 2 more people putting in your code

4th card 2 more people putting in your code

5th card 5 more people putting in your code

6th card 10 more people putting in your code

7th card 15 more people putting in your code