Yet another great game we'll never see

[A Black Falcon]

Using Gamefaqs...

List of Japanese-only Goemon games (yes, some are re-releases or remakes, but it's hard to tell which are that and which are original games without more investigation)

ARC Mr. Goemon
GB Ganbare Goemon: Kurofune Tou no Nazo
Ganbare Goemon: Sarawareta Ebisumaru!
GBA Famicom Mini: Mystical Ninja
Goemon New Age Shutsudou!
GBC Ganbare Goemon: Hoshizorashi Dynamites Arawaru!!
Ganbare Goemon: Mononoke Sugoroku
Ganbare Goemon: Tengu-to no Gyuakushu!
MSX Ganbare Goemon
N64 Ganbare Goemon: Mononoke Sugoroku
NES Ganbare Goemon 2
Ganbare Goemon Gaiden 2
Ganbare Goemon Gaiden: Kieta Ougon Kiseru
Ganbare Goemon! Karakuri Douchuu
PS Ganbare Goemon: Kurunarakoi!
Ganbare Goemon: Ooedo Daikaiten
Ganbare Goemon: Uchuu Kaizoku Akogingu
Goemon: Shin Sedai Shuumei
PS2 Bouken Jidai Katsugeki: Goemon
SNES Ganbare Goemon 2
Ganbare Goemon 3
Ganbare Goemon: Kirakira Douchuu
Soreyuke Ebisumaru: Karakuri Meiro - Karakuri Meiro - Kieta Goemon no Nazo

List of Goemon games released in America as well

N64 Goemon's Great Adventure
Mystical Ninja starring Goemon
SNES Legend of the Mystical Ninja

Unreleased... hmm, I wonder why I'm skeptical?

DS Mystical Ninja
GBA Kessakusen! Ganbare Goemon 1+2