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Out Run (Mega-Tech, SMS based)	Oriental Legend Special Plus / Xi You Shi E Zhuan Super Plus	Out Run (sitdown/upright, Rev B)	Oriental Legend / Xi You Shi E Zhuan (ver. 112, Chinese Board)

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Letter: O

• Oba-Oba (set 1)
• Oba-Oba (set 2)
• Octopus (Nova) (MPU4)
• Odds On (Barcrest) (MPU3)
• Odin
• Odin De Luxe
• Odisea Paris-Dakar
• Oedo Fight (Japan Bloodshed Ver.)
• Off Road Challenge (v1.10)
• Off Road Challenge (v1.30)
• Off Road Challenge (v1.40)
• Off Road Challenge (v1.50)
• Off Road Challenge (v1.63)
• Off The Charts (Russia)
• Off the Wall (2-player cocktail)
• Off the Wall (2/3-player upright)
• Off the Wall (Sente)
• Off Your Face (Bellfruit) (Scorpion 4) (set 1)
• Off Your Face (Bellfruit) (Scorpion 4) (set 2)
• Office Yeo In Cheon Ha (version 1.2)
• Offroad Thunder
• Oh La La (Stella)
• Oh My God! (Japan)
• Oh! Bakyuuun (Japan, OB1/VER.A)
• Oh! Paipee (Japan 890227)
• Oigas (bootleg)
• Oinori-daimyoujin Matsuri
• Oishii Puzzle Ha Irimasenka
• Ojanko Club (Japan)
• Ojanko High School (Japan)
• Ojanko Yakata (Japan)
• Ojanko Yakata 2bankan (Japan)
• Ojousan (Japan 871204)
• Ojousan [BET] (Japan 870108)
• Old Coney Island!
• Old Timer (Barcrest) (Dutch) (MPU4) (DOT1.1)
• Old Timer (Barcrest) (Dutch, alt 'Black and White' sound roms) (DOT1.1)
• Old Timer (Barcrest) (Dutch, alt 'JPM Classic' sound roms) (DOT1.1)
• Oli-Boo-Chu
• Ollie King (GDX-0007)
• Olympia (Dutch) (Bellfruit) (Scorpion 1)
• Olympian Games (Russia)
• Olympic Games
• Olympic Gold (Bellfruit) (set 1, UK) (Scorpion 2/3)
• Olympic Gold (Bellfruit) (set 1, UK, Protocol) (Scorpion 2/3)
• Olympic Gold (Bellfruit) (set 2, UK, 10GBP Jackpot) (Scorpion 2/3)
• Olympic Gold (Bellfruit) (set 2, UK, 10GBP Jackpot, Protocol) (Scorpion 2/3)
• Olympic Gold (German) (Nova) (MPU4) (set 1)
• Olympic Gold (German) (Nova) (MPU4) (set 2)
• Olympic Hot Stuff (TAS 5 Reel System)
• Olympic Soccer '92 (set 1)
• Olympic Soccer '92 (set 2)
• Olympus
• Omega
• Omega (Barcrest) (Dutch) (MPU4)
• Omega (Maygay) (M1A/B) (set 1)
• Omega (Maygay) (M1A/B) (set 2)
• Omega Fighter
• Omega Fighter Special
• Omega Race (set 1)
• Omega Race (set 2)
• Omni
• Omni (Shuffle) (L-1)
• Omotesandou (Japan 890215)
• On Line (Pcp) (MPU3)
• On The Box (Ace) (sp.ACE) (set 1)
• On The Box (Ace) (sp.ACE) (set 10)
• On The Box (Ace) (sp.ACE) (set 11)
• On The Box (Ace) (sp.ACE) (set 12)
• On The Box (Ace) (sp.ACE) (set 13)
• On The Box (Ace) (sp.ACE) (set 14)
• On The Box (Ace) (sp.ACE) (set 15)
• On The Box (Ace) (sp.ACE) (set 2)
• On The Box (Ace) (sp.ACE) (set 3)
• On The Box (Ace) (sp.ACE) (set 4)
• On The Box (Ace) (sp.ACE) (set 5)
• On The Box (Ace) (sp.ACE) (set 6)
• On The Box (Ace) (sp.ACE) (set 7)
• On The Box (Ace) (sp.ACE) (set 8)
• On The Box (Ace) (sp.ACE) (set 9)
• On The Buses (Maygay) (M1A/B) (set 1)
• On The Buses (Maygay) (M1A/B) (set 10)
• On The Buses (Maygay) (M1A/B) (set 11)
• On The Buses (Maygay) (M1A/B) (set 12)
• On The Buses (Maygay) (M1A/B) (set 13)
• On The Buses (Maygay) (M1A/B) (set 14)
• On The Buses (Maygay) (M1A/B) (set 15)
• On The Buses (Maygay) (M1A/B) (set 16)
• On The Buses (Maygay) (M1A/B) (set 17)
• On The Buses (Maygay) (M1A/B) (set 2)
• On The Buses (Maygay) (M1A/B) (set 3)
• On The Buses (Maygay) (M1A/B) (set 4)
• On The Buses (Maygay) (M1A/B) (set 5)
• On The Buses (Maygay) (M1A/B) (set 6)
• On The Buses (Maygay) (M1A/B) (set 7)
• On The Buses (Maygay) (M1A/B) (set 8)
• On The Buses (Maygay) (M1A/B) (set 9)
• On The Fiddle (Barcrest) (MPU5) (set 1)
• On The Fiddle (Barcrest) (MPU5) (set 2)
• On The Piste (Ace) (sp.ACE) (set 1)
• On The Piste (Ace) (sp.ACE) (set 10)
• On The Piste (Ace) (sp.ACE) (set 11)
• On The Piste (Ace) (sp.ACE) (set 12)
• On The Piste (Ace) (sp.ACE) (set 13)
• On The Piste (Ace) (sp.ACE) (set 14)
• On The Piste (Ace) (sp.ACE) (set 15)
• On The Piste (Ace) (sp.ACE) (set 16)
• On The Piste (Ace) (sp.ACE) (set 17)
• On The Piste (Ace) (sp.ACE) (set 2)
• On The Piste (Ace) (sp.ACE) (set 3)
• On The Piste (Ace) (sp.ACE) (set 4)
• On The Piste (Ace) (sp.ACE) (set 5)
• On The Piste (Ace) (sp.ACE) (set 6)
• On The Piste (Ace) (sp.ACE) (set 7)
• On The Piste (Ace) (sp.ACE) (set 8)
• On The Piste (Ace) (sp.ACE) (set 9)
• On The Up (Mazooma) (Scorpion 4) (set 1)
• On The Up (Mazooma) (Scorpion 4) (set 2)
• One + Two
• One + Two (earlier)
• One Shot One Kill
• Oni - The Ninja Master (Japan)
• Only Fools & Horses (Bellfruit) (set 1) (Scorpion 2/3)
• Only Fools & Horses (Bellfruit) (set 2) (Scorpion 2/3)
• Only Fools & Horses (Bellfruit) (set 3) (Scorpion 2/3)
• Only Fools & Horses (Bellfruit) (set 4) (Scorpion 2/3)
• Only Fools & Horses (Bellfruit) (set 5) (Scorpion 2/3)
• Only Fools and Horses (Bellfruit) (Scorpion 1?)
• Onna Sansirou - Typhoon Gal (set 1)
• Onna Sansirou - Typhoon Gal (set 2)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 1)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 2)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 3)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 4)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 5)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 6)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 7)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 8)
• Ooh Aah Dracula (Barcrest) (MPU4) (set 9)
• Ooh Aah Dracula (Barcrest) (MPU5) (set 1)
• Ooh Aah Dracula (Barcrest) (MPU5) (set 2)
• Ooh Aah Dracula Club (Barcrest) (MPU5) (set 1)
• Ooh Aah Dracula Club (Barcrest) (MPU5) (set 2)
• Ooh Aah Dracula Club (Barcrest) (MPU5) (set 3)
• Ooh Ahh Dracula Rio (Barcrest) (MPU5)
• Oozumou - The Grand Sumo (DECO Cassette, Japan)
• Opa Opa (MC-8123, 317-0042)
• Open Mahjong [BET] (Japan)
• Open Sesame (Bellfruit) (Scorpion 4) (set 1)
• Open Sesame (Bellfruit) (Scorpion 4) (set 2)
• Open The Box (Ace) (sp.ACE) (set 1)
• Open The Box (Ace) (sp.ACE) (set 10)
• Open The Box (Ace) (sp.ACE) (set 2)
• Open The Box (Ace) (sp.ACE) (set 3)
• Open The Box (Ace) (sp.ACE) (set 4)
• Open The Box (Ace) (sp.ACE) (set 5)
• Open The Box (Ace) (sp.ACE) (set 6)
• Open The Box (Ace) (sp.ACE) (set 7)
• Open The Box (Ace) (sp.ACE) (set 8)
• Open The Box (Ace) (sp.ACE) (set 9)
• Open The Box (Barcrest) (MPU5) (set 1)
• Open The Box (Barcrest) (MPU5) (set 2)
• Open The Box (Barcrest) (MPU5) (set 3)
• Open The Box (Barcrest) (MPU5) (set 4)
• Operation Bear (bootleg of Operation Wolf)
• Operation Thunder Hurricane (ver EAA)
• Operation Thunder Hurricane (ver UAA)
• Operation Thunderbolt (Japan)
• Operation Thunderbolt (US)
• Operation Thunderbolt (US, older)
• Operation Thunderbolt (World)
• Operation Tiger
• Operation Wolf (Japan)
• Operation Wolf (US)
• Operation Wolf (World, set 1)
• Operation Wolf (World, set 2)
• Operation Wolf 3 (US)
• Operation Wolf 3 (World)
• Operation: Thunder
• Option 3 (v1.0) (Datapak) (MPU4 Video)
• Option 3 (v1.0) (MPU4 Video)
• Options Unlimited (Barcrest) (MPU3)
• Oracle (Dutch) (Bellfruit) (Scorpion 1)
• Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221)
• Orange Club - Maruhi Kagai Jugyou (Japan 880213)
• Orbit
• Orbit 1
• Orbitor 1
• Orbitron
• Orbs (10/7/94 prototype?)
• Ordyne (Japan)
• Ordyne (Japan, English Version)
• Oriental Diamonds (Barcrest) (German) (MPU4)
• Oriental Legend / Xi You Shi E Zhuan (ver. 105, Korean Board)
• Oriental Legend / Xi You Shi E Zhuan (ver. 111, Chinese Board)
• Oriental Legend / Xi You Shi E Zhuan (ver. 111, Taiwanese Board)
• Oriental Legend / Xi You Shi E Zhuan (ver. 112)
• Oriental Legend / Xi You Shi E Zhuan (ver. 112, Chinese Board)
• Oriental Legend / Xi You Shi E Zhuan (ver. 126)
• Oriental Legend / Xi You Shi E Zhuan (ver. ???, Chinese Board)
• Oriental Legend 2 (V101, China)
• Oriental Legend 2 (V103, China)
• Oriental Legend 2 (V104, China)
• Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 100, set 1)
• Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 100, set 2)
• Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 101, Korean Board)
• Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 103, China, Tencent) (unprotected)
• Oriental Legend Special Plus / Xi You Shi E Zhuan Super Plus
• Orlando Magic (Bwb) (MPU4) (set 1)
• Orlando Magic (Bwb) (MPU4) (set 2)
• Orlando Magic (Bwb) (MPU4) (set 3)
• Orlando Magic (Bwb) (MPU4) (set 4)
• Orlando Magic (Bwb) (MPU4) (set 5)
• Orlando Magic (Bwb) (MPU4) (set 6)
• Orlando Magic (Bwb) (MPU4) (set 7)
• Orlando Magic (Bwb) (MPU4) (set 8)
• Orlando Magic (Bwb) (MPU4) (set 9)
• Osman (World)
• Othello (version 3.0)
• Othello Derby (Japan)
• Othello Shiyouyo (J 980423 V1.002)
• Otogizoushi Urashima Mahjong (Japan)
• Otona no Mahjong (Japan 880628)
• Ougon no Shiro (Japan)
• Out Run (bootleg)
• Out Run (deluxe sitdown)
• Out Run (Japan, deluxe sitdown, FD1089A 317-0019)
• Out Run (Mega-Tech, SMS based)
• Out Run (sitdown/upright)
• Out Run (sitdown/upright, Rev A)
• Out Run (sitdown/upright, Rev B)
• Out Run 2 (Rev A) (GDX-0004A)
• Out Run 2 Special Tours (Rev A) (GDX-0014A)
• Out Zone
• Out Zone (harder)
• Out Zone (old set)
• Out Zone (older set)
• Out Zone (oldest set)
• Outlaw (Bellfruit) (Scorpion 4) (set 1)
• Outlaw (Bellfruit) (Scorpion 4) (set 2)
• Outlaw (Bellfruit) (Scorpion 4) (set 3)
• Outlaw (Bellfruit) (Scorpion 4) (set 4)
• Outlaw (JPM) (IMPACT, Club?)
• Outlaw (JPM) (IMPACT, v3)
• Outlaw (JPM) (IMPACT, v3) (Protocol)
• Outlaw [TTL]
• Outline
• Outrun 2 SP SDX
• OutRunners (Japan)
• OutRunners (US)
• OutRunners (World)
• OutTrigger (JPN, USA, EXP, KOR, AUS)
• Over Drive (set 1)
• Over Drive (set 3)
• Over Moon Pt3 (Bwb) (MPU4 Video)
• Over Rev (Model 2B, Revision B)
• Over Rev (Model 2C, Revision A)
• Over The Moon (Barcrest) (MPU4) (set 1)
• Over The Moon (Barcrest) (MPU4) (set 10)
• Over The Moon (Barcrest) (MPU4) (set 11)
• Over The Moon (Barcrest) (MPU4) (set 12)
• Over The Moon (Barcrest) (MPU4) (set 13)
• Over The Moon (Barcrest) (MPU4) (set 14)
• Over The Moon (Barcrest) (MPU4) (set 15)
• Over The Moon (Barcrest) (MPU4) (set 16)
• Over The Moon (Barcrest) (MPU4) (set 17)
• Over The Moon (Barcrest) (MPU4) (set 18)
• Over The Moon (Barcrest) (MPU4) (set 19)
• Over The Moon (Barcrest) (MPU4) (set 2)
• Over The Moon (Barcrest) (MPU4) (set 20)
• Over The Moon (Barcrest) (MPU4) (set 21)
• Over The Moon (Barcrest) (MPU4) (set 22)
• Over The Moon (Barcrest) (MPU4) (set 23)
• Over The Moon (Barcrest) (MPU4) (set 24)
• Over The Moon (Barcrest) (MPU4) (set 25)
• Over The Moon (Barcrest) (MPU4) (set 26)
• Over The Moon (Barcrest) (MPU4) (set 27)
• Over The Moon (Barcrest) (MPU4) (set 28)
• Over The Moon (Barcrest) (MPU4) (set 29)
• Over The Moon (Barcrest) (MPU4) (set 3)
• Over The Moon (Barcrest) (MPU4) (set 30)
• Over The Moon (Barcrest) (MPU4) (set 31)
• Over The Moon (Barcrest) (MPU4) (set 32)
• Over The Moon (Barcrest) (MPU4) (set 33)
• Over The Moon (Barcrest) (MPU4) (set 34)
• Over The Moon (Barcrest) (MPU4) (set 35)
• Over The Moon (Barcrest) (MPU4) (set 36)
• Over The Moon (Barcrest) (MPU4) (set 4)
• Over The Moon (Barcrest) (MPU4) (set 5)
• Over The Moon (Barcrest) (MPU4) (set 6)
• Over The Moon (Barcrest) (MPU4) (set 7)
• Over The Moon (Barcrest) (MPU4) (set 8)
• Over The Moon (Barcrest) (MPU4) (set 9)
• Over The Moon (Maygay) (EPOCH) (1.2, set 1)
• Over The Moon (Maygay) (EPOCH) (1.2, set 2)
• Over The Moon Club (Maygay) (EPOCH) (set 1)
• Over The Moon Club (Maygay) (EPOCH) (set 2)
• Over The Rainbow (Astra, V102)
• Over The Rainbow (Astra, V104)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 1)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 2)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 3)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 4)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 5)
• Over The Rainbow (Bellfruit) (Scorpion 5) (set 6)
• Over The Top (Maygay) (M1A/B) (set 1)
• Over The Top (Maygay) (M1A/B) (set 2)
• Over Top
• Overload (Barcrest) (MPU5) (set 1)
• Overload (Barcrest) (MPU5) (set 2)
• Overload (Barcrest) (MPU5) (set 3)
• Overload (Barcrest) (MPU5) (set 4)
• Oxo (JPM) (IMPACT) (set 1)
• Oxo (JPM) (IMPACT) (set 2)
• Oxo (JPM) (IMPACT) (set 3)
• Oxo (JPM) (IMPACT) (set 4)
• Oxo (JPM) (IMPACT) (set 5)
• Oxo (JPM) (IMPACT) (set 6)
• Oxo Bingo (JPM) (IMPACT) (set 1)
• Oxo Bingo (JPM) (IMPACT) (set 2)
• Oxo Bingo (JPM) (IMPACT) (set 3)
• Oxo Bingo (JPM) (IMPACT) (set 4)
• Oxo Bingo (JPM) (IMPACT) (set 5)
• Oxo Bingo (JPM) (IMPACT) (set 6)
• Oxo Bingo (JPM) (IMPACT) (set 7)
• Oxo Classic Gold (Electrocoin) (?)
• Oxo Club (Electrocoin) (?)
• Oxo Golden Bars (Electrocoin) (?)
• Oxo Reels (Electrocoin) (?)
• Oxo Revolution (Electrocoin) (?)
• Ozma Wars (set 1)
• Ozma Wars (set 2)
• Ozon I
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) ( .2, set 2)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (0.2, set 8)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (0.2, set 9)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (1.1, set 5)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (1.1, set 6)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (2.Z, set 1)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (2.Z, set 7)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (5.J, set 3)
• Ozzie Ozzie Ozzie (Maygay) (EPOCH) (6.J, set 4)