| K9.5 5 - The Howlywood Premiere | US | 1998 |
The Lightspan Partnership | Commercial |
| KazMania 1 - Trail of Gems | US | 1998 |
The Lightspan Partnership | Commercial |
| KazMania 2 - Chaos in KazMania | US | 1998 |
The Lightspan Partnership | Commercial |
| Kenshou Akou Jiken - Chuushingura - Rekishi Adventure | JP | 1998-01 |
Toei Animation | Commercial |
| Konami Antiques - MSX Collection Vol. 2 | JP | 1998-01-22 |
Konami | Commercial |
| Kakinoki Shougi II | JP | 1998-03 |
ASCII Entertainment | Commercial |
| Konami Antiques - MSX Collection Vol. 3 | AS | 1998-03 |
Konami | Commercial |
| Kumitate Battle Kuttu Ketto | JP | 1998-03-12 |
Technosoft | Commercial |
| Konami Antiques - MSX Collection Vol. 3 | JP | 1998-03-19 |
Konami | Commercial |
| Kindaichi Shounen no Jikenbo - Jigoku Yuuen Satsujin Jiken | JP | 1998-03-26 |
Kodansha | Commercial |
| Kouryuuki | JP | 1998-03-26 |
Koei | Commercial |
| Klaymen Klaymen - Neverhood no Nazo | JP | 1998-04 |
Riverhill Soft | Commercial |
| Koguma-chan no Daibouken | JP | 1998-04 |
Sunmark | Commercial |
| Kojin Kyouju - La Lecon Particuliere | JP | 1998-04-09 |
Mycom | Commercial |
| Kojin Kyouju - La Lecon Particuliere | JP | 1998-04-09 |
Mycom | Demo |
| Kahen Soukou Gunbike - Speed Power Gunbike | JP | 1998-04-23 |
Sony Music Entertainment | Commercial |
| Kattobi Tune | JP | 1998-04-23 |
Genki | Commercial |
| Kattobi Tune | JP | 1998-04-23 |
Genki | Demo |
| Keiba Eight '98 Haru Natsu | JP | 1998-04-29 |
Shangri-La | Commercial |
| Kitchen Panic | JP | 1998-05-28 |
Panther Software | Commercial |
| K.O. - The Live Boxing | JP | 1998-06 |
Altron | Commercial |
| Kick Off World | AU | 1998-06 |
Funsoft | Commercial |
| Kick Off World | DE | 1998-06 |
Funsoft | Commercial |
| Kick Off World | EU | 1998-06 |
Funsoft | Commercial |
| Kick Off World | GR | 1998-06 |
Funsoft | Commercial |
| Kick Off World | GR | 1998-06 |
Funsoft | Demo |
| Kick Off World Manager | IT | 1998-06 |
Funsoft | Commercial |
| Klonoa - Door to Phantomile | DE | 1998-06-05 |
Sony | Commercial |
| Klonoa - Door to Phantomile | ES | 1998-06-05 |
Sony | Commercial |
| Klonoa - Door to Phantomile | EU | 1998-06-05 |
Sony | Commercial |
| Klonoa - Door to Phantomile | EU | 1998-06-05 |
Namco Hometek | Prototype |
| Klonoa - Door to Phantomile | FR | 1998-06-05 |
Sony | Commercial |
| Klonoa - Door to Phantomile | IT | 1998-06-05 |
Sony | Commercial |
| King of Parlor 2 | JP | 1998-06-11 |
TEN Institute | Commercial |
| Kaette Kita Pachio-kun - Dream Collection | JP | 1998-07 |
Coconuts Japan | Commercial |
| Kagero - Kokumeikan Shinshou | JP | 1998-07 |
Tecmo | Commercial |
| Klonoa - Door to Phantomile | US | 1998-07 |
Namco | Commercial |
| Kula World | EU | 1998-07 |
Psygnosis | Commercial |
| Kartia - The Word of Fate | US | 1998-08-07 |
Atlus | Commercial |
| Kaisoku Tenshi - The Rapid Angel | JP | 1998-08-13 |
Techno Soleil | Commercial |
| Klaymen Klaymen 2 - Skullmonkey no Gyakushuu | JP | 1998-08-13 |
Riverhill Soft | Commercial |
| Kawa no Nushi-tsuri - Hikyou o Motomete | JP | 1998-08-20 |
Victor Interactive Software | Commercial |
| King of Bowling 2 - Professional-hen | JP | 1998-08-27 |
Coconuts Japan Entertainment | Commercial |
| Kimagure My Baby - Musume no Sugoroku Seichouki | JP | 1998-09 |
Axela | Commercial |
| Kaze no Oka Kouen Nite | JP | 1998-09-02 |
Techno Soft | Commercial |
| Knight & Baby | JP | 1998-09-23 |
Tamsoft | Commercial |
| Kagero - Deception II | US | 1998-10 |
Tecmo | Commercial |
| Kagero - Deception II | US | 1998-10 |
Tecmo | Demo |
| Kamen Rider | JP | 1998-10-01 |
Bandai | Commercial |
| Kamen Rider | JP | 1998-10-01 |
Bandai | Demo |
| Kasei Monogatari | JP | 1998-10-22 |
ASCII Entertainment | Commercial |
| Keiba Eight '98 Aki Fuyu | JP | 1998-10-22 |
Shangri-La | Commercial |
| Kensei - Sacred Fist | EU | 1998-11 |
Konami | Commercial |
| Kensei - Sacred Fist | EU | 1998-11 |
Konami | Prototype |
| Kitty the Kool! Kabuki de Tanoshiku Odotte ne!! | JP | 1998-11 |
Imageneer | Commercial |
| Knockout Kings | US | 1998-11 |
Electronic Arts | Commercial |
| Knockout Kings 99 | EU | 1998-11 |
Electronic Arts | Commercial |
| Knockout Kings 99 | FR | 1998-11 |
Electronic Arts | Commercial |
| Kensei - Sacred Fist | US | 1998-11-30 |
Konami | Commercial |
| Kuon no Kizuna | JP | 1998-12-03 |
F·O·G (Full On Games) | Commercial |