| Nintendo 3DS cart. |  Kawaii Koinu 3D Model CTR-ACTJ-JPN | 201? | MTO, Inc. Japan |
| Nintendo 3DS cart. | Kawaii Koneko 3D Model CTR-AKCJ-JPN | 201? | MTO, Inc. Japan |
| Nintendo 3DS cart. | Ken to Mahou to Gakuen Mono 3D Model CTR-AKNJ-JPN | 201? | Acquire Corp. Japan |
| Nintendo 3DS cart. | Kenka Banchou 6 Soul and Blood Model CTR-BC6J-JPN | 201? | Spike Chunsoft Japan |
| Nintendo 3DS cart. |  Ketzals Corridors Model CTR-JELE-USA | 201? | Nintendo of America, Inc. USA 45496 |
| Nintendo 3DS cart. | Kid Icarus - Uprising Model CTR-AKDE-USA | 201? | Nintendo of America, Inc. USA 45496 |
| Nintendo 3DS cart. | Kid Icarus - Uprising Model CTR-AKDP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kingdom Hearts 3D - Dream Drop Distance Model CTR-AKHJ-JPN | 201? | Square Enix Co., Ltd. Japan |
| Nintendo 3DS cart. | Kingdom Hearts 3D - Dream Drop Distance Model CTR-AKHP-EUR | 201? | Square Enix Co., Ltd. Japan |
| Nintendo 3DS cart. | Kingdom Hearts 3D Dream Drop Distance Model CTR-AKHE-USA | 201? | Square Enix Co., Ltd. Japan |
| Nintendo 3DS cart. | Kiniro no Corda 3 - Full Voice Special Model CTR-BC3J-JPN | 201? | KOEI Tecmo Games Co., Ltd. Japan |
| Nintendo 3DS cart. | Kinki no Magna Model CTR-BKKJ-JPN | 201? | Marvelous Ent., Inc. |
| Nintendo 3DS cart. | Kipper no Eigo Kyoushitsu - Floppys Phonics Vol.1 - Kipper-Hen Model CTR-AFZJ-JPN | 201? | IE Institute Co., Ltd. |
| Nintendo 3DS cart. | Kipper no Eigo Kyoushitsu - Floppys Phonics Vol.2 - Biff-Hen Model CTR-AX2J-JPN | 201? | IE Institute Co., Ltd. |
| Nintendo 3DS cart. | Kipper no Eigo Kyoushitsu - Floppys Phonics Vol.3 - Chip-Hen Model CTR-AX3J-JPN | 201? | IE Institute Co., Ltd. |
| Nintendo 3DS cart. | Kira*Meki Oshare Salon! Watashi no Shigoto wa Biyoushi-San Model CTR-AATJ-JPN | 201? | Sonic Powered |
| Nintendo 3DS cart. | Kirameki Waku Waku Sweets Model CTR-BSWJ-JPN | 201? | Sonic Powered |
| Nintendo 3DS cart. | Kirby Fighters Deluxe Model CTR-JVXE-USA | 201? | Nintendo of America, Inc. USA 45496 |
| Nintendo 3DS cart. | Kirby Fighters Deluxe Model CTR-JVXP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirby Triple Deluxe Model CTR-BALE-USA | 201? | Nintendo of America, Inc. USA 45496 |
| Nintendo 3DS cart. | Kirby Triple Deluxe Model CTR-BALP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirbys Block Ball Model CTR-RBKP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirbys Dream Land 2 Model CTR-RBNP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirbys Dream Land Model CTR-RAFP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirbys Pinball Land Model CTR-RBZP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kirbys Star Stacker Model CTR-RBYP-EUR | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kobayashi Ga Kawai Sugi Tsurai !! Game Demo Kyun Moe MAX ga Tomara Nai Model CTR-BKQJ-JPN | 201? | Happinet |
| Nintendo 3DS cart. | Kobito Dukan - Kobito Kansatsu Set Model CTR-AKVJ-JPN | 201? | Nippon Columbia |
| Nintendo 3DS cart. | Kobito Dukan - Kobito no Fushigi Jikken Set Model CTR-BK2J-JPN | 201? | Nintendo Co., Ltd. Japan |
| Nintendo 3DS cart. | Kodomo ni Anshin Shite Ataerareru Game Series - Sekai Meisaku Douwa - Oyako de Yomeru Game Ehon Bouken-Hen Model CTR-AY5J-JPN | 201? | Alchemist Co., Ltd. Japan |
| Nintendo 3DS cart. | Kodomo ni Anshin Shite Ataerareru Game Series - Sekai Meisaku Douwa - Oyako de Yomeru Game Ehon Princess-Hen Model CTR-AY4J-JPN | 201? | Alchemist Co., Ltd. Japan |
| Nintendo 3DS cart. | Kokuga Model CTR-AK8E-USA | 201? | G.Rev |
| Nintendo 3DS cart. | Kokuga Model CTR-AK8J-JPN | 201? | G.Rev |
| Nintendo 3DS cart. | Konchuu Monster Super Battle Model CTR-BUXJ-JPN | 201? | Culture Brain |
| Nintendo 3DS cart. | Koneko no Album -My Little Cat- Model CTR-BLCJ-JPN | 201? | MTO, Inc. Japan |
| Nintendo 3DS cart. | Koueki Zaidan Houjin Nippon Kanji Nouryoku Kentei Kyoukai KanKen Training Model CTR-AXFJ-JPN | 201? | Rocket Co. Japan |
| Nintendo 3DS cart. | Kuma Tomo Model CTR-AKMJ-JPN | 201? | Bandai NAMCO Games, Inc. Japan |
| Nintendo 3DS cart. | Kumamon Bomber Puzzle de Kumamon Taisou Model CTR-BKMJ-JPN | 201? | Rocket Co. Japan |
| Nintendo 3DS cart. | Kung Fu Panda - Showdown of Legendary Legends Model CTR-BKFE-USA | 201? | Little Orbit |
| Nintendo 3DS cart. | Kung Fu Panda - Showdown of Legendary Legends Model CTR-BKFP-EUR | 201? | Little Orbit |
