: Can be purchased on the PlayStation Store (PS4/Vita cross-buy), Xbox Store , and Nintendo eShop .
While is a commercial title that generally requires a purchase, you can often find its predecessor, Hydorah , available as a free legal download. Official Purchase & Download Options Super Hydorah Free Download
: An expanded "ultimate" version with 21 levels, 35 bosses, a 60+ track soundtrack, and local co-op. Super Hydorah on Steam : Can be purchased on the PlayStation Store
: Offers 16 levels and 30 bosses. It is widely available on legacy indie game hosting sites like Uptodown . you can often find its predecessor