Fee Level field of the Participant Search doesn't seem to have any affect when Price Sets are used.

When searching for event participants, entering text in the Fee Level field, there seems to be no difference in the results when there are Price Sets with multiple options. I have tested this in version 3.0.2 and recreated it in the Sandbox last week. The test event / price sets and registrations I created in the sandbox are now gone, so, unfortunately I can't point you to that. I notice that the Fee Level does work properly in the sandbox when searching for a single fee option created through the event. However, if you create a price set for an event with multiple options, it does not work. For events with multiple options, all of the data is stored in the fee_level field. So, the search should use wildcards to match any text entered into that search (e.g.: civicrm_participant.fee_level LIKE '%search terms%')