| Sega Dreamcast GD |  Kaze no Uta Model T-47501M | 2004 | Rain Soft. Japan |
| Slot Machine | Keepin' It Reel | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Slot Machine | Keg Party | 2004 | IGT International Game Technologies Reno, NV, USA |
| Sammy Atomiswave cart. |  Kenju | 2004 | Sammy Corp. Japan |
| Slot Machine | Keno Invaders | 2004 | IGT International Game Technologies Reno, NV, USA |
| Nintendo DS cart. | Kenshuui Tendou Dokuta | 2004 | Spike Japan |
| IBM PC/AT DOS pack. | Kerboom! Sw | 2004 | PLBM Games |
| Nintendo GBA cart. | Keroro Gunsou - Taiketsu! Gekisou Keronprix Daisakusen de Arimasu!! Model AGB-BKJJ-JPN | 2004 | Sunrise Interactive |
| PC/MS-Windows CD | Keys of the Kingdom | 2004 | Left Behind Games |
| Redemption mechanical game | Kick 4 Cash | 2004 | SEGA Corp. |
| Strength Tester | Kicker Whistle | 2004 | Kalkomat Krakow, Poland |
| Nintendo GBA cart. | Kidou Senshi Gundam Seed - Tomo to Kimi to Koko de. Model AGB-BGNJ-JPN | 2004 | Bandai Co., Ltd. Japan |
| Nintendo GBA cart. | Kidou Senshi Gundam Seed Destiny Model AGB-B42J-JPN | 2004 | Bandai Co., Ltd. Japan |
| Nintendo GBA cart. | Kien Prototype | 2004 | DSI Games |
| Nintendo GBA cart. | Kill.Switch Model AGB-BKHE-USA | 2004 | DSI Games |
| Nintendo GBA cart. | Kill.Switch Model AGB-BKHP | 2004 | Zoo Digital Publishing |
| Sony PlayStation 2 disc |  kill.switch Model SCES-52124 | 2004 | Sony Computer Ent. Europe SCEE |
| Nintendo DS cart. | Kimi no Tame Nara Shineru | 2004 | SEGA Corp. |
| Nintendo GameCube disc | King Arthur Model DOL-GKHE-USA | 2004 | Konami Digital Ent. Co., Ltd. |
| Slot Machine | King Bling | 2004 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | King Cat | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Slot Machine | King Kamoolah Moolah | 2004 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | King Midas | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Video Slot Machine | King Neptune | 2004 | Aristocrat Leisure Industries Pty, Ltd. |
| Slot Machine | King of Africa | 2004 | WMS Gaming, Inc. Chicago, IL, USA |
| Slot Machine | King of Cards | 2004 | AGI Austrian Gaming Industries Novomatic Group |
| Pachislot | King of King Pulsar - Premium Version | 2004 | Yamasa Japan |
| Pachislot | King of the Maharaja | 2004 | Taiyo Co., Ltd. Japan |
| Slot Machine | King Payback | 2004 | IGT International Game Technologies Reno, NV, USA |
| Slot Machine | King Rich | 2004 | IGT International Game Technologies Reno, NV, USA |
| Medal video game | King Solomon | 2004 | Unknown Korea |
| Slot Machine | King Tiki | 2004 | Konami Gaming, Inc. Las Vegas, NV, USA |
| Slot Machine | King's Legend | 2004 | Konami Gaming, Inc. Las Vegas, NV, USA |
| Nintendo GBA cart. | Kingdom Hearts - Chain of Memories Model AGB-B8CE-USA | 2004 | Square Enix Co., Ltd. Japan |
| Nintendo GBA cart. | Kingdom Hearts - Chain of Memories Model AGB-B8CJ-JPN | 2004 | Square Enix Co., Ltd. Japan |
| Microsoft XBOX disc | Kingdom Under Fire - The Crusaders | 2004 | Microsoft |
| Slot Machine | Kingpin Bowling | 2004 | IGT International Game Technologies Reno, NV, USA |
| Nintendo GBA cart. | Kirby & the Amazing Mirror Model AGB-B8KE-USA | 2004 | Nintendo of America, Inc. USA 45496 |
| Nintendo GBA cart. | Kirby & the Amazing Mirror Model AGB-B8KP | 2004 | Nintendo Co., Ltd. Japan |
| Nintendo GameCube disc | Kirby Air Ride Model DOL-GKYP-EUR | 2004 | Nintendo Co., Ltd. Japan |
