Hi @jedi_rask! You could set a custom attribute something like `first_group: true` and create a targeting rule based on this property. The reason I suggest a boolean is because we don’t yet support less than or greater than filters for custom attributes. You would have to keep track of the number of users in your app on your end and set this attribute via the SDK.

If you’re okay with less precision, you could also set up a targeting rule by app version. When you’ve had n users (give or take) take advantage of your initial deal, you could release a new version, which your targeting rule could then use.