Originally released in the US, but there was a story to the game that got removed. As fate would have it, Mad Hacker got the story translated and released a patch for the Japanese version. Although his version was not without issues. For those wondering, the game is not called Gryzor. The name is Contra. Anyway, I've got a brand new patch that looks and feels beautiful. I must note that the original translation patch isn't terrible by any means, but my work is of a higher quality.