Here is the list of every Sega Saturn games and demos that are compatible with different regional hardware:

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List of games and demos that are compatible with any Sega Saturn (Region Free)   

Game(s) :
	Croc - Legend of the Gobbos [191x58]
	Croc - Legend of the Gobbos [T-16105H]
	Lost & Found Vol. 1 [LF1]
	Scud - The Disposable Assassin [14003]
	Tama ~Adventurous Ball in Giddy Labyrinth~ [T-4801G]
	Time Warner Interactive's V.R. Virtua Racing [T-4801H-50]
	Time Warner Interactive's V.R. Virtua Racing [T-4803G]
	Time Warner Interactive's V.R. Virtua Racing [T-4801H]
Demo(s) :
	Preview Sega Saturn Vol. 1 [610-6377]
	Winter Heat Demo Disc [MK81125-50]
	WWF Wrestlemania The Arcade Game Demo Version [T-8112H-50DEMO]

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List of games and demos that are compatible with Japanese and USA Sega Saturn  

Game(s) :
	Ayrton Senna Personal Talk ~Message for the Future~ [GS-9020]
	Baku Baku [81501]
	Battle Arena Toshinden Remix [81029]
	Cleaning Kit for Sega Saturn [T-25901H]
	Clockwork Knight 2 [81036]
	Dark Savior [81304]
	Decathlete [81115]
	Enemy Zero [191326]
	Enemy Zero [81076]
	Golden Axe The Duel [81045]
	Hang On GP [81202]
	ManX TT Super Bike [191x49]
	ManX TT Super Bike [81210]
	NBA Action 98 [191406]
	NBA Action 98 [81124]
	NHL All-Star Hockey 98 [81122]
	Nights Into Dreams... [81020]
	Nights Into Dreams... with 3D Control Pad [81048]
	Panzer Dragoon Zwei [81022]
	Race Drivin' [T-4802G]
	Sega International Victory Goal [GS-9044]
	Sega Worldwide Soccer '97 [193346]
	Sega Worldwide Soccer '97 [81112]
	The Legend of Oasis [81302]
	The Mansion of Hidden Souls [81012]
	Virtua Cop 2 [193606]
	Virtua Cop 2 [81043]
	Virtua Cop 2 with Virtua Gun [81052]
	Virtual-On - Cyber Troopers [81042]
	Wing Arms [81024]
Demo(s) :
	Christmas Nights Into Dreams Sampler [81067]
	Sega Saturn Choice Cuts [81600]

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List of games and demos that are compatible with USA and European Sega Saturn  

Game(s) :
	Shanghai: Triple-Threat [T-13001H]

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List of games and demos that are compatible with Japanese and European Sega Saturn  
None