| My Life My Love - Boku no Yume - Watashi no Negai | 1991 | nes |
| NSM Poker | | arcade |
| Nada Asatarou & Kojima Takeo no Jissen Mahjong Kyoushitsu | 1998 | gb |
| Nada Asatarou no Powerful Mahjong - Tsugi no Itte 100 Dai | 1994 | gb |
| Nakajima Tetsuya no Othello Seminar | 2002 | xbox |
| Nakayoshi Mahjong - KabuReach | 2001 | gba |
| Namco Museum 50th Anniversary | 2005 | gc |
| Namcot Mahjong III - Mahjong Tengoku | 1991 | nes |
| Naniwa Kinyuudou - Aoki Yuji no Seken Munazanyou | 2001 | ps1 |
| Naniwa no Akindo - Futte Nanbo no Saikoro Jinsei | 1997 | ps1 |
| The Nanpa | 1999 | arcade |
| Naruto - Shinobi no Sato no Jintori Gassen | 2003 | ps1 |
| Natsuiro Mahjong | 1989 | arcade |
| Nekketsu Grand-Prix Gal | 1991 | arcade |
| Nekketsu Mahjong Sengen! AFTER 5 | 1991 | arcade |
| Nep-Nep Connect - Chaos Chanpuru | 2017 | vita |
| Net Versus - Chess | 2001 | dreamcast |
| Net Versus - Gomoku Narabe to Renju | 2001 | dreamcast |
| Net Versus - Hanafuda | 2001 | dreamcast |
| Net Versus - Igo | 2001 | dreamcast |
| Net Versus - Mahjong | 2001 | dreamcast |
| Net Versus - Reversi | 2001 | dreamcast |
| Net Versus - Shougi | 2001 | dreamcast |
| Nevada | | arcade |
| The New 1997 Joker Master | 1997 | arcade |
| The New 1997 Joker Master - New York | 1997 | arcade |
| New Biliard 98 | 1998 | arcade |
| New Champion Skill | 2000 | arcade |
| The New Chessmaster | 1998 | gb |
| The New Chessmaster | 1993 | gb |
| New Double Bet Mahjong | 1981 | arcade |
| New Hi-Low Poker | | arcade |
| New Jinsei Game | 2004 | ps2 |
| New Magic Card | 2000 | arcade |
| New York Joker | 2000 | arcade |
| Nice Price Series Vol. 01 - Nihon Pro Mahjong Renmei Kounin - Honkaku Pro Mahjong | 2001 | ps1 |
| Nice Price Series Vol. 02 - Honkaku Shougi Shinan | 2001 | ps1 |
| Nice Price Series Vol. 03 - Hanafuda & Card Game | 2002 | ps1 |
| Nice Price Series Vol. 05 - Chess & Reversi | 2002 | ps1 |
| Nice Price Series Vol. 10 - Igo o Utou! | 2002 | ps1 |
| Nichibutsu Mahjong - Joshikou Meijinsen | 1995 | ps1 |
| Nichibutsu Mahjong - Yoshimoto Gekijou | 1994 | gb |
| Nichibutsu Mahjong III - Mahjong G Men | 1990 | nes |
| Night Bunny | 1984 | arcade |
| Night Gal | 1984 | arcade |
| Night Gal Summer | 1985 | arcade |
| Night Love | 1986 | arcade |
| Nihon Pro Mahjong Kishikai Kanshuu - Pro ni Naru Mahjong DS | 2005 | nds |
| Nihon Pro Mahjong Renmei Kounin - Doujou Yaburi | 1997 | ps1 |
| Nihon Pro Mahjong Renmei Kounin - Doujou Yaburi | 1997 | saturn |
| Nihon Pro Mahjong Renmei Kounin - Doujou Yaburi 2 | 2001 | ps1 |
| Nihon Pro Mahjong Renmei Kounin - Honkaku Pro Mahjong - Shin Tetsuman | 1998 | ps1 |
| Nihon Pro Mahjong Renmei Kounin - Tehodoki Mahjong Nyuumon-hen | 1999 | ps1 |
| Nihon Pro Mahjong Renmei Kounin - Tetsuman Advance - Menkyo Kaiden Series | 2002 | gba |
| Nihon Pro Mahjong Renmei Kounin - Tetsuman Menkyokaiden | 1999 | dreamcast |
| Ninteiou - Zen Nihon Tsume Shougi Renmei Kaichou Okada Toshi no Tsume Shougi Kyoushitsu | 1998 | ps1 |
| Nippon Ichi Mahjong - Souryuu | 2002 | ps1 |
| Nomark Baku Haitou - Shijou Saikyou no Janshi-tachi | 1995 | snes |
| Noraut Deluxe Poker | | arcade |
| Noraut Jacks Plus / Joker Poker | 2002 | arcade |
| Noraut Joker Poker | 1988 | arcade |
| Noraut Poker | 1988 | arcade |
| Noraut Red Hot Joker Poker | 1988 | arcade |
| Noughts & Crosses | | snes |
| Novo Play Club Card | 1991 | arcade |
| Novo Play Multi Card / Club Card | 1986 | arcade |
| Nozokimeguri Mahjong Peep Show | 1989 | arcade |
| Number Dieci | 2000 | arcade |
| Number One | 1996 | arcade |
| Nurete Mitaino... - Net Idol Hen | 2000 | arcade |
| Obocchama-kun | 1991 | nes |
| Ogwangui Darin DS | 2009 | nds |
| Oja Majo DoReMi Dokkan! Nijiiro ParaDice | 2002 | ps1 |
| Ojanko Club | 1986 | arcade |
| Ojanko High School | 1988 | arcade |
| Ojanko Yakata | 1986 | arcade |
| Ojanko Yakata 2bankan | 1987 | arcade |
| Ojarumaru - Tsukiyo ga Ike no Takaramono | 2000 | gbc |
| Ojousan | 1987 | arcade |
| Okiraku Daifugou Wii - Honkaku Wi-Fi Net Taisen | | wii |
| Okumanchouja Game - Nottori Daisakusen! | 2001 | gba |
| Omotesandou | 1989 | arcade |
| The Oni Taiji!! - Mezase! Nidaime Momotarou | 1995 | ps1 |
| Online Games - Dai Guru Guru Onsen | 2002 | ps2 |
| Ooedo Fuusui Ingaritsu - Hanabi 2 | 2000 | ps1 |
| Oogami Ichirou Funtouki - Sakura Taisen Kayou Show Beni Tokage yori | 2000 | dreamcast |
| Open 5 Cards | 1987 | arcade |
| Open Mahjong | 1981 | arcade |
| Orange Club - Maru-hi Ippatsu Kaihou | 1988 | arcade |
| Orange Club - Maruhi Kagai Jugyou | 1988 | arcade |
| The Original Rummikub - Brings People Together | 2008 | nds |
| Oshigoto-shiki Jinsei Game - Mezase Shokugyou King | 2003 | ps1 |
| Othello | 1980 | a2600 |
| Othello | 1993 | cdi |
| Othello | 1986 | fds, nes |
| Othello | 1990 | gb |
| Othello | 2005 | lynx |
| Othello | 1986 | nes |
| Othello | 2009 | psp, switch, vita, wii, wiiu |
| Othello | 1985 | sg1000 |