We do not offer source category targeting as a generally available product. You can, however, use the report builder to view the source categories of source app IDs.
For example, if you are looking to target the arcade category, you can copy and paste the respective source app IDs for targeting. Source targeting can also pinpoint specific sources performing well against your KPIs, such as ROAS or retention, and add them as part of targeting for best performance.
If your account is managed, please contact your Unity point of contact if you are interested in a list of the top sources per category and other metrics. If your account is unmanaged, please reach out using this email address.