A list of arcade games that support an optional, unique second screen (not a doubled output):
[Games that can played with joysticks and buttons]
Backfire!
Cyberball
Dunk Dream '95 / Hoops '96 (pinout in post 7) (pics of game running in post 10)
Hard Dunk
Lode Runner: The Dig Fight (pic of official link harness here) (pinout in post 7)
Quiz de Idol! Hot Debut
Run And Gun 2
Rushing Heroes
Stadium Cross
Title Fight
Touch And Go
VersusNet Soccer
World Rally 2
[Games that need special controllers]
Cool Riders (handlebar controller)
Jong Yu Ki (mahjong controller)
Jong Tou Ki (mahjong controller)
OutRunners (steering wheel)
Taisen Hot Gimmick (mahjong controller)
Taisen Hot Gimmick Kairakuten (mahjong controller)
Taisen Hot Gimmick 3 Digital Surfing (mahjong controller)
Taisen Hot Gimmick 4 Ever (mahjong controller)
Taisen Hot Gimmick Integral (mahjong controller)
Taisen Idol-Mahjong Final Romance 2 (mahjong controller)
Taisen Mahjong Final Romance R (mahjong controller)
Taisen Mahjong Final Romance 4 (mahjong controller)
EDIT: cleaned up OP and added a ton of games. Thanks guys!
EDIT 2: removed a ton of games. Sorry!
[Games that can played with joysticks and buttons]
Backfire!
Cyberball
Dunk Dream '95 / Hoops '96 (pinout in post 7) (pics of game running in post 10)
Hard Dunk
Lode Runner: The Dig Fight (pic of official link harness here) (pinout in post 7)
Quiz de Idol! Hot Debut
Run And Gun 2
Rushing Heroes
Stadium Cross
Title Fight
Touch And Go
VersusNet Soccer
World Rally 2
[Games that need special controllers]
Cool Riders (handlebar controller)
Jong Yu Ki (mahjong controller)
Jong Tou Ki (mahjong controller)
OutRunners (steering wheel)
Taisen Hot Gimmick (mahjong controller)
Taisen Hot Gimmick Kairakuten (mahjong controller)
Taisen Hot Gimmick 3 Digital Surfing (mahjong controller)
Taisen Hot Gimmick 4 Ever (mahjong controller)
Taisen Hot Gimmick Integral (mahjong controller)
Taisen Idol-Mahjong Final Romance 2 (mahjong controller)
Taisen Mahjong Final Romance R (mahjong controller)
Taisen Mahjong Final Romance 4 (mahjong controller)
EDIT: cleaned up OP and added a ton of games. Thanks guys!
EDIT 2: removed a ton of games. Sorry!
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