: Offers 16 levels and 30 bosses. It is widely available on legacy indie game hosting sites like Uptodown .
: An iOS version is typically available for around $4.99 on the App Store. Free Alternative: Original "Hydorah" 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 : Offers 16 levels and 30 bosses