| | Noraut Red Hot Joker Poker | 1988 | Noraut Ltd. | norautrh | | 0.00 |
 | Nyan Nyan Panic (Japan) (clone of: kittenk) | 1988 | Konami | nyanpani | Puzzle | 0.00 |
 | Ojanko High School (Japan) | 1988 | V-System Co. | ojankohs | Tabletop / Mahjong *Mature* | 4.00 |
 | Operation Thunderbolt (Japan) (clone of: othunder) | 1988 | Taito Corporation | othunderj | | 0.00 |
| Operation Thunderbolt (US) (clone of: othunder) | 1988 | Taito America Corporation | othunderu | | 0.00 |
| Operation Thunderbolt (US, older) (clone of: othunder) | 1988 | Taito America Corporation | othunderuo | | 0.00 |
| Operation Thunderbolt (World) | 1988 | Taito Corporation Japan | othunder | Shooter / Gun | 8.47 |
![Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221)](../snapsmall/MS_2430.html) | Orange Club - Maru-hi Ippatsu Kaihou [BET] (Japan 880221) (clone of: orangec) | 1988 | Daiichi Denshi | orangeci | Tabletop / Mahjong *Mature* | 0.00 |
| Orange Club - Maruhi Kagai Jugyou (Japan 880213) | 1988 | Daiichi Denshi | orangec | Tabletop / Mahjong *Mature* | 0.00 |
 | Ordyne (Japan) (clone of: ordyne) | 1988 | Namco | ordynej | Shooter / Flying Horizontal | 0.00 |
| Ordyne (Japan, English Version) | 1988 | Namco | ordyne | Shooter / Flying Horizontal | 8.56 |
 | Otona no Mahjong (Japan 880628) | 1988 | Apple | otonano | Tabletop / Mahjong *Mature* | 0.00 |
 | P-47 - The Freedom Fighter (Japan) (clone of: p47) | 1988 | Jaleco | p47j | Shooter / Flying Horizontal | 0.00 |
| P-47 - The Phantom Fighter (World) | 1988 | Jaleco | p47 | Shooter / Flying Horizontal | 7.25 |
 | P.O.W. - Prisoners of War (US version 1) | 1988 | SNK | pow | Fighter / 2.5D | 7.54 |
 | Paddle 2 (bootleg on Block hardware) (clone of: arkanoid) | 1988 | bootleg | paddle2 | Breakout | 0.00 |
 | Paddle Mania | 1988 | SNK | paddlema | Sports | 6.50 |
 | Passing Shot (2 Players) (bootleg) (clone of: passsht) | 1988 | bootleg | passshtb | Sports / Tennis | 0.00 |
| Passing Shot (4 Players) (bootleg) (clone of: passsht) | 1988 | bootleg | passht4b | Sports / Tennis | 0.00 |
| Passing Shot (Japan, 4 Players, FD1094 317-0070) (clone of: passsht) | 1988 | Sega | passshtj | Sports / Tennis | 0.00 |
