| Kien | US | 2004 |
DSI Games | Prototype |
| Kien | WORLD | 2004 |
DSI Games | Unlicensed |
| Koinu to Issho 2 | JP | 2004-04 |
Culture Brain | Commercial |
| Kidou Senshi Gundam SEED - Tomo to Kimi to Koko de | JP | 2004-05 |
Bandai | Commercial |
| Koutetsu Teikoku | JP | 2004-05 |
Zoo Digital Publishing | Commercial |
| Kaiketsu Zorori to Mahou no Yuuenchi - Ohimesama o Sukue! | JP | 2004-07 |
Bandai | Commercial |
| Kirby & The Amazing Mirror | EU | 2004-07 |
Nintendo | Commercial |
| Konjiki no Gashbell!! - Makai no Bookmark | JP | 2004-07 |
Banpresto | Commercial |
| Kill Switch | EU | 2004-09 |
Zoo Digital Publishing | Commercial |
| Kill Switch | US | 2004-09 |
Zoo Digital Publishing | Commercial |
| Kim Possible 2 - Drakken's Demise | EU | 2004-09 |
Buena Vista Games | Commercial |
| Kim Possible 2 - Drakken's Demise | US | 2004-09 |
Buena Vista Games | Commercial |
| Kirby & The Amazing Mirror | US | 2004-10 |
Nintendo | Commercial |
| Knights' Kingdom | EU | 2004-10 |
THQ | Commercial |
| Knights' Kingdom | US | 2004-10 |
THQ | Commercial |
| Kawaii Koinu Wonderful | JP | 2004-11 |
Ubisoft | Commercial |
| Kidou Senshi Gundam SEED Destiny | JP | 2004-11 |
Bandai | Commercial |
| Kingdom Hearts - Chain of Memories | JP | 2004-11 |
Square Enix | Commercial |
| Kawaii Pet Game Gallery 2 | JP | 2004-12 |
Culture Brain | Commercial |
| Keroro Gunsou - Taiketsu! Gekisou Keronprix Daisakusen de Arimasu!! | JP | 2004-12 |
Sunrise Interactive | Commercial |
| Kingdom Hearts - Chain of Memories | US | 2004-12 |
Square Enix | Commercial |
| Kiss x Kiss - Seirei Gakuen | JP | 2004-12 |
Bandai | Commercial |
| Konjiki no Gashbell!! - Unare! Yuujou no Zakeru 2 | JP | 2004-12 |
Banpresto | Commercial |