| K3 en de Vrolijke Noten | NL | 2004-01 |
Studio 100 | Commercial |
| Kaigo Navi DS | JP | 2004-01 |
Voltec | Commercial |
| Kalle Kunskap - 4-7 Aar | EU | 2004-01 |
The Learning Company | Commercial |
| Kanji Sonomama - DS Rakubiki Jiten | JP | 2004-01 |
Nintendo | Commercial |
| Kantan! Tanoshii! - Okashi Navi DS | JP | 2004-01 |
Koei | Commercial |
| Keltis - Das Spiel von Reiner Knizia | DE | 2004-01 |
United Soft Media | Commercial |
| Kid Paddle - Blorks Invasion | EU | 2004-01 |
Atari | Commercial |
| Kid Paddle - Lost in the Game | FR | 2004-01 |
Atari | Commercial |
| Kikansha Thomas - DS de Hajimeru Chiiku Gakushuu | JP | 2004-01 |
Rocket Company | Commercial |
| Kilari - Deviens une Star | EU | 2004-01 |
Konami | Commercial |
| Kilari - Na-san, Mon Meilleur Ami | EU | 2004-01 |
Konami | Commercial |
| Kingdom Hearts - 358-2 Days | JP | 2004-01 |
Square Enix | Commercial |
| Kingdom Hearts - 358-2 Days | US | 2004-01 |
Square Enix | Commercial |
| Kirikou and the Wild Beasts | EU | 2004-01 |
Atari | Prototype |
| Kirikou et les Betes Sauvages | EU | 2004-01 |
Atari | Commercial |
| Knock 'Em Downs - World's Fair | EU | 2004-01 |
Guidance Interactive | Commercial |
| Knock 'Em Downs - World's Fair | US | 2004-01 |
Guidance Interactive | Commercial |
| Know How 2 | EU | 2004-01 |
cdv Software | Commercial |
| Koh-Lanta | FR | 2004-01 |
Mindscape | Commercial |
| Koh-Lanta - Survie dans la Jungle! | FR | 2004-01 |
Mindscape | Commercial |
| Kreuzwortraetsel DS - Welt Edition | DE | 2004-01 |
Game Corporation | Commercial |
| Kumatanchi | JP | 2004-01 |
Dimple Entertainment | Commercial |
| Kunio-kun no Chou Nekketsu! - Daiundoukai | JP | 2004-01 |
Aksys Games | Commercial |
| Kunio-kun no Chou Nekketsu! - Soccer League Plus - World Hyper Cup Hen | JP | 2004-01 |
Arc System Works | Commercial |
| Kuukan Zukei - Hirameki Training - Kuutore | JP | 2004-01 |
Benesse | Commercial |
| Kenshuui Tendo Dokuta | JP | 2004-12 |
Spike | Commercial |
| Kimi no Tame Nara Shineru | JP | 2004-12 |
Sega | Commercial |