The 'Winners uniqueness' option is only available on Instant Win games.
It is shown as a drop-down list and it allows you to choose the number of rewards a user can win on your campaign's instant win game(s), i.e., one-time reward or multiple wins.
The available options are:
No uniqueness: The user can win several rewards.
Winners uniqueness 'on the instant win page': The user can only win one reward on this instant win page. However, if your campaign has other instant win games, the user will be able to win several rewrds during that campaign: one on this particular instant win game, and one or more on your campaign's other instant win games.
Winners uniqueness 'on the campaign': The user will not be able to win more than one reward, regardless of the number of instant win games included in this campaign.
