Here is a WIP list of japanese Sega Saturn games that never came with a regcard (registration card). The games listed here are 100% verified (aka a sealed game has been opened to be sure there isn't any regcard), we didn't list games for which we are not 100% sure.

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List of japanese games that never came with a regcard

Game(s) :
	3D Lemmings [T-15013G]
	3D Mission Shooting Finalist [T-18511G]
	Airs Adventure [T-20301G]
	Battle Garegga [T-10627G]
	Black Fire [T-7003G]
	Black Matrix [T-20118G]
	Chaos Control [T-7002G]
	Crows ~The Battle Action for SegaSaturn~ [T-16806G]
	CyberBots ~FullMetal Madness~ Chou Genteiban [T-1216G]
	Defcon 5 [T-24101G]
	Digital Monster Ver. S. Digimon Tamers [T-13331G]
	Dragon Ball Z Shinbutouden [T-13302G]
	Garou Densetsu 3 ~Haruka Naru Tatakai~ [T-3102G]
	Gyuwanburaa Jikochuushinha ~Tokyo Mahjongland~ (Satakore) [T-4508G]
	Hansha de Spark! [T-20902G]
	Heisei Tensai Bakabon Susume! Bakabons [T-17001G]
	Impact Racing [T-7307G]
	Kaitei Daisensou ~Torppedoes armed and ready!~ [T-15006G]
	Kidou Senshi Gundam [T-13303G]
	Kidou Senshi Gundam Gaiden III ~Sabakareshi Mono~ (Genteiban) [T-13312G]
	Kidou Senshi Gundam Gihren no Yabou [T-13330G]
	Kidou Senshi Z Gundam ~Zenpen Zeta no Kodou~ [T-13315G]
	Magical Hoppers [T-13316G]
	Mahou Gakuen Lunar! [T-27902G]
	Media ROMancer Daisuke Asakura [T-25001G]
	My Fair Lady Virtual Maajan 2 [T-2207G]
	Myst [T-26801H-16]
	NHL 97 [T-10620G]
	Olympic Soccer [T-7304G]
	Pad Nifty [GS-7101]
	Puzzle Bobble 2X [T-1106G]
	Puzzle Bobble 2X & Space Invaders [T-1111G]
	Pyon Pyon Kyaruru no Maajan Hiyori [T-31101G]
	R?MJ The Mystery Hospital [T-13322G]
	Road Rash [T-10609G]
	Sangokushi V (distributed by FREETRON CO.) [T-7606H-11]
	Sentimental Graffiti [T-20106G]
	Sentimental Graffiti ~First Window~ [T-20111G]
	Shanghai Great Moments [T-1512G]
	Slayers Royal 2 [T-27907G]
	Sokkou Seitokai [T-20611G]
	Sonic 3D Flickies' Island [GS-9143]
	Space Invaders [T-1107G]
	StarFighter 3000 [T-15012G]
	Super Casino Special [T-7306G]
	Takuramakan ~Tonkou Denki~ [T-25102G]
	The King of Fighters '95 [T-3101G]
	Tokusou Kidoutai J SWAT [T-20602G]
	Transport Tycoon [T-15028G]
	UltraMan ~Hikari no Kyojin Densetsu~ [T-13308G]
	Worms [T-22405G]

(51 entries so far)