Developers sometimes partner with sites like IndieGala, Steamgifts, or Fanatical to give away old versions during sales events. Check r/FreeGameFindings on Reddit.
If a friend owns it on Steam or Switch, you can play together via: Boomerang Fu Download Gratis -v1.3.4-
✅ Best legal free option: Download the Steam demo – it’s surprisingly generous and allows 4-player local play. Developers sometimes partner with sites like IndieGala ,