▲ 20 r/goemon
Daishuugo includes a hidden game: "Crisis Force", a shmup published in 1991 for the Famicom only in Japan.
You can watch the video here if you're interested in how to access it. From what I could understand, you have to insert a "code" in the settings menu.
This marks the first time in history where this game gets a re-release.
u/StanRyk — 4 days ago