Oba-Oba 7 Ko
Oba-Oba (alternate set) 8 Ko Odin De Luxe 5 Ko Odisea Paris-Dakar 10 Ko Oedo Fight (Japan Bloodshed Ver.) 1.07 Mo Off Road Challenge (v1.10) 2.85 Mo Off Road Challenge (v1.30) 2.85 Mo Off Road Challenge (v1.40) 2.85 Mo Off Road Challenge (v1.63) 14.93 Mo Off the Wall (2-player cocktail) 405 Ko Off the Wall (2/3-player upright) 428 Ko Off the Wall (Sente) 31 Ko Office Yeo In Cheon Ha (version 1.2) 12.3 Mo Offroad Thunder 252 Ko Oh My God! (Japan) 2.04 Mo Oh! Paipee (Japan 890227) 343 Ko Ohgon no Siro (Japan) 78 Ko Oigas (bootleg) 65 Ko Oinori-daimyoujin Matsuri 27.5 Mo Oishii Puzzle Ha Irimasenka 2.03 Mo Ojanko Club (Japan) 168 Ko Ojanko High School (Japan) 519 Ko Ojanko Yakata (Japan) 435 Ko Ojanko Yakata 2bankan (Japan) 414 Ko Ojousan (Japan 871204) 318 Ko Ojousan [BET] (Japan 870108) 304 Ko Old Coney Island! 5 Ko Old Timer 27 Ko Oli-Boo-Chu 35 Ko Ollie King (GDX-0007) 189 o Olympic Hot Stuff (TAS 5 Reel System) 128 Ko Olympic Soccer '92 381 Ko Olympus 188 Ko Omega 12 Ko Omega Fighter 487 Ko Omega Fighter Special 41 Ko Omega Race (set 1) 15 Ko Omega Race (set 2) 15 Ko Omni 13 Ko Omni (Shuffle) (L-1) 4 Ko Omotesandou (Japan 890215) 338 Ko One + Two 753 Ko One + Two (earlier) 562 Ko One Shot One Kill 2.17 Mo Oni - The Ninja Master (Japan) 116 Ko Onna Sansirou - Typhoon Gal (set 1) 121 Ko Onna Sansirou - Typhoon Gal (set 2) 27 Ko Opa Opa (MC-8123, 317-0042) 164 Ko Open Mahjong [BET] (Japan) 16 Ko Operation Bear (bootleg of Operation Wolf) 903 Ko Operation Thunder 499 Ko Operation Thunder Hurricane (ver EAA) 11.03 Mo Operation Thunder Hurricane (ver UAA) 585 Ko Operation Thunderbolt (Japan) 60 Ko Operation Thunderbolt (US) 94 Ko Operation Thunderbolt (US, older) 60 Ko Operation Thunderbolt (World) 1.75 Mo Operation Tiger 23.31 Mo Operation Wolf (Japan) 21 Ko Operation Wolf (US) 21 Ko Operation Wolf (World, set 1) 864 Ko Operation Wolf (World, set 2) 21 Ko Operation Wolf 3 (US) 242 Ko Operation Wolf 3 (World) 7.29 Mo Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221) 22 Ko Orange Club - Maruhi Kagai Jugyou (Japan 880213) 578 Ko Orbit 9 Ko Orbit 1 4 Ko Orbitor 1 11 Ko Orbitron 10 Ko Orbs (10/7/94 prototype?) 2.15 Mo Ordyne (Japan) 83 Ko Ordyne (Japan, English Version) 1.21 Mo Oriental Legend / Xi You Shi E Zhuan (ver. 105, Korean Board) 695 Ko Oriental Legend / Xi You Shi E Zhuan (ver. 111, Chinese Board) 696 Ko Oriental Legend / Xi You Shi E Zhuan (ver. 112) 681 Ko Oriental Legend / Xi You Shi E Zhuan (ver. 112, Chinese Board) 681 Ko Oriental Legend / Xi You Shi E Zhuan (ver. 126) 16.49 Mo Oriental Legend / Xi You Shi E Zhuan (ver. ???, Chinese Board) 720 Ko Oriental Legend 2 48.61 Mo Oriental Legend Special / Xi You Shi E Zhuan Super (alt ver. 100) 860 Ko Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 100) 846 Ko Oriental Legend Special / Xi You Shi E Zhuan Super (ver. 101, Korean Board) 20.11 Mo Oriental Legend Special Plus / Xi You Shi E Zhuan Super Plus 22 Mo Osman (World) 6.32 Mo Othello (version 3.0) 26 Ko Othello Derby (Japan) 1.32 Mo Othello Shiyouyo (J 980423 V1.002) 10.19 Mo Otogizoushi Urashima Mahjong (Japan) 823 Ko Otona no Mahjong (Japan 880628) 418 Ko Out Run (bootleg) 857 Ko Out Run (deluxe sitdown) 580 Ko Out Run (Mega-Tech, SMS based) 140 Ko Out Run (sitdown/upright) 579 Ko Out Run (sitdown/upright, Rev A) 81 Ko Out Run (sitdown/upright, Rev B) 856 Ko Out Run 2 (Rev. A) (GDX-0004A) 196 o Out Run 2 Special Tours (GDX-0014A) 1 Ko Out Zone (set 1) 930 Ko Out Zone (set 2) 91 Ko Out Zone (set 3, prototype?) 86 Ko Out Zone (set 4) 91 Ko Out Zone (set 5) 100 Ko Outfoxies (Japan, OU1) 276 Ko Outfoxies (World, OU2) 8.05 Mo Outline 18 Ko OutRunners (US) 123 Ko OutRunners (World) 11.59 Mo OutTrigger (JPN, USA, EXP, KOR, AUS) 73.24 Mo Over Drive 3 Mo Over Rev (Revision A) 13.49 Mo Over Top 11.69 Mo Ozma Wars (set 1) 9 Ko Ozma Wars (set 2) 5 Ko Ozon I 9 Ko