Japanese Exclusive Gamecube games only released on the Gamecube:
Bleach GC
Bobobo-bo Bo-bobo
Captain Tsubusa
Charinko Hero
Donkey Konga 3
Doraemon: Let's Play Everybody! Minidora
Dragon Drive: D-Masters shot
Family Stadium 2002
Generations of Chaos Exceed
Gekituisenki: Zero Fighter
Giftpia
Hikaru no Go 3
Homeland
Mobile Suit Gundam: The Ace Pilot
Kiwame Mahjong DX2
Kururin Squash!
Legend of the Golfer
The Legend of The Quiz: Tournament of Champions
Lupin III: Uninikieta Hihou
Mr. Drill Land
Muscle Champion or Martial Champion
Mutsu Tonohohon
Naruto: Gekitou Ninja Taisen (Clash of The Ninja) 3
Naruto: Gekitou Ninja Taisen (Clash of The Ninja) 4
Nintendo Puzzle Collection
One Piece: Treasure Battle
Ohenro-San
Pool Edge
Rei Fighter Gekitsui Senki
SD Gundam Gashapon Wars
Shaman King: Soul Fight
Special Jinsei Game (game of life special)
Zoids Vs.
Zoids Vs. III
Japanese Exclusive Gamecube games also released on other systems only in Japan:
The Baseball 2003 (PS2)
Battle Stadium D.O.N. (PS2)
Bomberland 2 (PS2)
Derby Tsuka: Derby Umaotsurou (PS2)
Dokapon DX (PS2)
DreamMix TV World Fighters (PS2)
Eisei Meijin (PS2)
Future GPX Cyber Formula: Road to Evolution (PS2)
Gakuen Toshi Vara Noir Roses or
Rose Varnowaru University City (PS2)
Gekito Pro Yakyu (PS2)
Harvest Moon : Poems of Happines (PS2)
Hudsen Selection Vol. 1: Cubic Lode Runner (PS2)
Hudsen Selection Vol. 2: Star Solider (PS2)
Hudsen Selection Vol. 3: PC Genjin (Bonk) (PS2)
Hudsen Selection Vol. 4: Takahishi Meijin no Adventure (PS2)
Konjiki no Gash Bell! (Zatch Bell) Yujono Tag Battle Full Power Croket! (PS2)
Momotaro Dentetsu 11 (PS2)
Momotaro Dentetsu 12 (PS2)
One Piece: Grand Battle 3! (PS2)
Super Robot Wars GC (XBOX360)
Tengai Makyoll: Manjimaru (PCE,PS2,DS)
Tensai Bit-kun: Gramon (PS2)
World Soccer Winning Eleven 6: Final Evolution (PS2)
Zoids Vs III (PS2)
Gamecube Japanese Exclusive but released in the States on other systems
Castle Shikigami 2 (DC J, PS2 NA)
Duel Masters (PS2 NA)
GT Cube (released as GT Pro Series Wii NA)
Mobile Suit Gundam: Gundam Vs. Zeta Gundam (PS2 NA)
Radiligy (DC J,PS2 J, Released on the Ultimate Shooting Collection Wii NA)
The Tower of Druga (Various systems NA)