| Pachislot |  Kagetu | 1998 | Yamasa Japan |
| Sony PlayStation CD | Kahen Soukou Gunbike - Speed Power Gunbike Model SLPS-01066 | 1998 | Sony Music Ent., Inc. Japan |
| Nintendo Game Boy Cart. | Kaisen Game - Navy Blue 98 Model DMG-A98J-JPN | 1998 | Shouei System Co., Ltd. Japan |
| Sony PlayStation CD | Kaisoku Tenshi - The Rapid Angel Model SLPS-01553 | 1998 | Techno Soleil |
| Sony PlayStation CD | Kakinoki Shougi II Model SLPS-01344 | 1998 | ASCII Corp. Japan |
| PC/MS-Windows CD | Kakyusei | 1998 | Elf Japan |
| Pachislot | Kamen Rider - The Strongest Masked Rider | 1998 | Sammy Corp. Japan |
| Sony PlayStation CD |  Kamen Rider Taikenban Model SLPM-80326 | 1998 | Bandai Co., Ltd. Japan |
| Sony PlayStation CD | Kamen Rider Model SLPS-01570 | 1998 | Bandai Co., Ltd. Japan |
| Sony PlayStation CD | Kaminari Ishiyumi Kihei Guybrave II Taikenban Model SLPM-80323 | 1998 | Axela |
| Sony PlayStation CD | Kaminari Ishiyumi Kihei Guybrave II Model SLPS-01643~4 | 1998 | Axela |
| Nintendo Game Boy Cart. | Kandume Monsters Model DMG-AKMJ-JPN | 1998 | I'Max Japan |
| Pachislot | Kappa | 1998 | Sammy Corp. Japan |
| Nintendo Game Boy Color cart. | Karamuchou wa Oosawagi! Polinkies to Okashina Nakama-tachi Model DMG-AOPJ-JPN | 1998 | Starfish, Inc. Japan |
| Commodore C64 cass. |  Karate Ace Model 030904 | 1998 | Star Games 013658 |
| PC/MS-Windows CD | Karma - Curse of the 12 Caves | 1998 | DreamCatcher Interactive |
| Sony PlayStation CD |  Kartia - The Word of Fate Model SLUS-00631 | 1998 | Atlus Co., Ltd. CA, USA |
| Sony PlayStation CD | Kasei Monogatari Model SLPS-01629 | 1998 | ASCII Corp. Japan |
| Sony PlayStation CD | Kasei Monogatari Model SLPS-01630 | 1998 | ASCII Corp. Japan |
| Nintendo Game Boy Cart. | Kaseki Sousei Reborn Model DMG-AKRJ-JPN | 1998 | Starfish, Inc. Japan |
| Pachinko | Kato Chan Family | 1998 | Okumura Japan |
| Pachinko | Kato Chan World | 1998 | Okumura Japan |
| Medal video game | Kattobase Power Pro Kun | 1998 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Kattobi Tune Taikenban Model SLPM-80223 | 1998 | Genki Co., Ltd. Japan |
| Sony PlayStation CD | Kattobi Tune Model SLPS-01253 | 1998 | Genki Co., Ltd. Japan |
| Sony PlayStation CD | Kawa no Nushi Tsuri - Hikyou wo Motomete Model SLPS-01536 | 1998 | Victor Interactive Soft., Inc. |
| Sega Pico game | Kawaii Nakama wo Sodate you! 3-tsu no Shippo Model HPC-6055 | 1998 | SEGA Enterprises, Ltd. Tokyo, Japan |
| Sony PlayStation CD | Kaze no Oka Kouen Nite Model SLPS-01565 | 1998 | Tecno Soft. TechnoSoft Japan |
| Sony PlayStation CD | Kazmania 1 - Trail of Gems Model LSP-????? | 1998 | Lightspan Partnership, The |
| Sony PlayStation CD | Kazmania 2 - Chaos in Kazmania Model LSP-????? | 1998 | Lightspan Partnership, The |
| Sony PlayStation CD | Keiba Eight '98 Akifuyu Model SLPS-01640 | 1998 | Shangri-La |
| Sony PlayStation CD | Keiba Eight '98 Haru Natsu Model SLPS-01372 | 1998 | Shangri-La |
| Sony PlayStation CD | Kensei - Sacred Fist Model SLES-01081 | 1998 | Konami Co., Ltd. Japan |
| Sony PlayStation CD | Kensei - Sacred Fist Model SLUS-00600 | 1998 | Konami of America CA, USA |
| Sony PlayStation CD | Kenshou Akou Jiken - Chuushingura - Rekishi Adventure Model SLPS-01186 | 1998 | Toei Animation Co., Ltd. Japan |
| Sega Saturn CD | Keriotosse! | 1998 | Masudaya Corp. Japan |
| Arcade Video game | Kick It! Jr. | 1998 | Interactive Light |
| PC/MS-Windows CD | Kick Off 98 | 1998 | Funsoft |
| PC/MS-Windows CD | Kick Off 98 | 1998 | Dinamic Multimedia, S.A. |
| Sony PlayStation CD | Kick Off World Manager Model SLES-01063 | 1998 | Funsoft |
