Player photos come from Wikimedia Commons under free licences (public domain, CC0, CC BY or CC BY-SA). Players without a freely licensed photo appear as a kit avatar.
Player facts (birth dates, nationalities, positions and club careers) come from Wikidata, which is free to reuse (CC0), and how well known a player is comes from Wikipedia pageview counts.
Squads in Mystery Baller (current clubs, positions and birth dates) come from football-data.org.
Club badges come from football-logos.cc. Club names and badges belong to their owners.
TactIQ is an independent quiz game. It is not affiliated with, or endorsed by, any club, league or federation.