Live Super Hydorah 1cc (all stages, all secrets) 719,090

A 1 credit clear while also completing all stages and finding the secret in each one. Doing so gets you the "Best Ending". Super Hydorah is an enhanced version of Locomalitos Freeware shmup "Hydora" still available here
It's a great homage to classic horizontal shmups. You can tell just by the sheer amount of unique music, sprites and backgrounds with each stage that a lot of love was put into this. while not the hardest game in the world, it's worth it just for the journey alone. it also should be getting an exA-Arcadia release titled "Super Hydorah AC" in the future.