FreeROMS.com - MAME ROMS. Top Rated ROM is Ultimate Mortal Kombat 3 (rev 1.2). U.N. Squadron (US) ROM has the most ROMS Votes.

Ultimate Mortal Kombat 3 (rev 1.2) ROM has the most votes on this ROMS page.
U.N. Squadron (US) ROM is the highest rated ROM on this ROMS page.

MAME ROMS U
Title	Rate	Votes	Rating
U.N. Defense Force: Earth Joker (Japan)		5	10.00
U.N. Squadron (US)		13	8.85
U.S. Championship V'ball (Japan)		3	8.67
U.S. Championship V'ball (set 1)		0	0
U.S. Classic		2	9.00
U.S. Navy (Japan 901012)		6	7.67
Ufo Senshi Yohko Chan		2	9.00
Ufo Senshi Yohko Chan (not encrypted)		0	0
Ultimate 11 - The SNK Football Championship / Tokuten Ou - Honoo no Libero, The		13	7.77
Ultimate Ecology (Japan 931203)		0	0
Ultimate Mortal Kombat 3 (rev 1.0)		23	8.70
Ultimate Mortal Kombat 3 (rev 1.1)		26	9.23
Ultimate Mortal Kombat 3 (rev 1.2)		56	8.45
Ultimate Tennis		7	5.57
Ultra Balloon		7	7.86
Ultra Maru-hi Mahjong (Japan)		1	9.00
Ultra Tank		3	9.33
Ultra Toukon Densetsu (Japan)		3	9.00
Ultra X Weapons / Ultra Keibitai		4	9.25

Ultraman (Japan)		9	9.44
Ultraman Club - Tatakae! Ultraman Kyoudai!!		4	9.25
Uncle Fester's Quest: The Addams Family (PlayChoice-10)		5	8.60
Under Fire (Japan)		2	6.50
Under Fire (US)		1	6.00
Under Fire (World)		5	9.40
Undercover Cops (Japan)		7	7.14
Undercover Cops (World)		10	6.80
UniWar S		1	9.00
Untitled Fighter 'BB' (prototype)		1	9.00
Untouchable (Japan)		2	9.00
Up Scope		0	0
Up Your Alley		1	9.00
Up'n Down		2	5.00
Up'n Down (not encrypted)		0	0
Urashima Mahjong		0	0
US AAF Mustang (bootleg)		0	0
US AAF Mustang (Japan)		4	9.25
US AAF Mustang (Seoul Trading)		0	0
Us vs. Them		3	9.33