- K-1 World GP (DS)
- Kabu Trader Shun (DS)
- Kachō Shima Kōsaku DS: Dekiru Otoko no Love & Successss (DS)
- KADOBAT WARS (Switch eShop)
- Kaeru no Tame ni Kane wa Naru (GB)
- Kaet Must Die! (Switch eShop)
- Kaiju Busters (DS)
- Kaiju Khaos (Switch eShop)
- KAIO: King of Pirates (3DS)
- Kaite Tsukutte Asoberu Dezaemon (SNES)
- Kakuro by Nikoli (3DS eShop)
- Kamen Rider Battle Ganbaride: Card Battle Taisen (DS)
- Kamen Rider: Dragon Knight (DS)
- KAMI (3DS eShop)
- Kamiko (Switch eShop)
- Kanji Sonomama Rakubiki Jiten (DS)
- Kao the Kangaroo Round 2 (GCN)
- Karaoke Revolution Party (GCN)
- Karate Phants: Gloves of Glory (WiiWare)
- Karateka (Wii U eShop)
- Karnov's Revenge (Neo Geo)
- Karous -The Beast of Re:Eden- (3DS eShop)
- Kart Krashers (DSiWare)
- Katamari Damacy REROLL (Switch eShop)
- Katana ZERO (Switch eShop)
- Katekyo Hitman Reborn DS: Fate of Heat (DS)
- Katekyo Hitman Reborn! DS - Shinuki Max! Vongola Carnival!! (DS)
- Katekyo Hitman Reborn! DS Flame Rumble X (DS)
- Keep Talking And Nobody Explodes (Switch eShop)
- Kelly Slater's Pro Surfer (GCN)
- Kemeko Deluxe! DS: Yome to Meka to Otoko to Onna (DS)
- Kemono Friends Picross (Switch eShop)
- Kemono Heroes (Switch eShop)
- Kemonomix+ (3DS eShop)
- Ken Griffey, Jr. Presents Major League Baseball (GB)
- Kenji: Rise of a Hero (Wii U eShop)
- Kenshō (Switch eShop)
- Kenshūi Tendo Doctor (DS)
- Kentucky Robo Chicken (Switch eShop)
- Kentucky Route Zero: TV Edition (Switch eShop)
- Kerbal Space Program (Wii U eShop)
- Kero Blaster (Switch eShop)
- Ketsui Death Label (DS)
- KEYTARI: 8-bit Music Maker (Wii U eShop)
- Kiai Resonance (Switch eShop)
- Kick & Fennick (Wii U eShop)
- KickBeat: Special Edition (Wii U eShop)
- Kid Chameleon (MD)
- Kid Dracula (GB)
- Kid Dracula (NES)
- Kid Icarus (NES)
- Kid Icarus: Of Myths and Monsters (GB)
- Kid Icarus: Uprising (3DS)
- Kid Klown in Crazy Chase (SNES)
- Kid Niki (GB)
- Kid Tripp (3DS eShop)
- Kid Tripp (Switch eShop)
- Kid? Senshi Gundam: Gundam vs. Z Gundam (GCN)
- Kid? Senshi Gundam: Senshitachi no Kiseki (GCN)
- Kidou Gekidan Haro Ichiza: Haro no Puyo Puyo (GBA)
- Kidz Bop Dance Party! The Video Game (Wii)
- Kill la Kill: IF (Switch)
- Kill The Bad Guy (Switch eShop)
- Killer Instinct (GB)
- Killer Instinct (SNES)
- Killer Instinct Gold (N64)
- Killer Queen Black (Switch)
- Killer7 (GCN)
- Kim Possible: Kimmunicator (DS)
- Kimi no Yusha (DS)
- Kine (Switch eShop)
- King Arthur (GCN)
- King Oddball (Switch eShop)
- King of Clubs (DS)
- King of Fighters 2001 (Neo Geo)
- King of Fighters Collection: The Orochi Saga (Wii)
- King of the Hat (Switch eShop)
- King of the Monsters (Neo Geo)
- King of the Monsters 2 (Neo Geo)
- King's Knight (NES)
- Kingdom Crusade (GB)
- Kingdom Hearts 358/2 Days (DS)
- Kingdom Hearts 3D: Dream Drop Distance (3DS)
- Kingdom Hearts Re:coded (DS)
- Kingdom Two Crowns (Switch eShop)
- Kingdom's Item Shop (3DS eShop)
- Kingdom: New Lands (Switch eShop)
- Kingmaker: Rise to the Throne (Switch eShop)
- Kira Kira Pop Princess (DS)
- Kirby & The Amazing Mirror (GBA)
- Kirby 64: The Crystal Shards (N64)
- Kirby Air Ride (GCN)
- Kirby and the Rainbow Curse (Wii U)
- Kirby Battle Royale (3DS)
- Kirby Fighters Deluxe (3DS eShop)
- Kirby Mass Attack (DS)
- Kirby Squeak Squad (DS)
- Kirby Star Allies (Switch)
- Kirby Super Star (SNES)
- Kirby Super Star Ultra (DS)
- Kirby Tilt 'n' Tumble (GBC)
- Kirby's Adventure (NES)
- Kirby's Avalanche (SNES)
- Kirby's Block Ball (GB)
- Kirby's Blowout Blast (3DS eShop)
- Kirby's Dream Collection: Special Edition (Wii)
- Kirby's Dream Course (SNES)
- Kirby's Dream Land (GB)
- Kirby's Dream Land 2 (GB)
- Kirby's Dream Land 3 (SNES)
- Kirby's Epic Yarn (Wii)
- Kirby's Extra Epic Yarn (3DS)
- Kirby's Pinball Land (GB)
- Kirby's Return to Dream Land (Wii)
- Kirby's Star Stacker (GB)
- Kirby: Canvas Curse (DS)
- Kirby: Nightmare in Dream Land (GBA)
- Kirby: Planet Robobot (3DS)
- Kirby: Triple Deluxe (3DS)
- Kissed by the Baddest Bidder (Switch eShop)
- Kitten Squad (Switch eShop)
- Kitty Love -Way to look for love- (Switch eShop)
- Kiwame Mahjong DX2 (GCN)
- Kizuna Encounter (Neo Geo)
- Klax (GB)
- Klondike Solitaire (Switch eShop)
- Klonoa (Wii)
- Klonoa 2: Dream Champ Tournament (GBA)
- Klonoa: Empire of Dreams (GBA)
- Knight Quest (GB)
- Knight Terrors (Switch eShop)
- Knights in the Nightmare (DS)
- Knights of Pen & Paper 2 Deluxiest Edition (Switch eShop)
- Knights of Pen and Paper +1 Deluxier Edition (Switch eShop)
- Knights of the Temple: Infernal Crusade (GCN)
- Knock 'Em Down! Bowling (Switch eShop)
- Knock-Knock (Switch eShop)
- Knockout Kings 2003 (GCN)
- Know Your Friends (Wii U)
- Knowledge Trainer: Trivia (Switch eShop)
- Knytt Underground (Wii U eShop)
- Kobe Bryant in NBA Courtside (N64)
- Koe de Asobou! HeartCatch PreCure! (DS)
- Koi DX (Switch eShop)
- Koi DX (Wii U eShop)
- Kokuga (3DS eShop)
- Koloro (Switch eShop)
- Kona (Switch eShop)
- Konami Classics Series: Arcade Hits (DS)
- Konami Krazy Racers (GBA)
- Konductra (DS)
- Konjiki no Gash Bell!! Go! Go! Mamono Fight!! (GCN)
- Konjiki no Gash Bell!! Y?j? no Tag Battle Full Power (GCN)
- Koral (Switch eShop)
- KORG DS-10 (DS)
- KORG DS-10 Plus (DS)
- KORG DSN-12 (3DS eShop)
- KORG Gadget (Switch eShop)
- KORG M01D (3DS eShop)
- Korokke! Ban-? no Kiki o Sukue (GCN)
- Kororinpa (Wii)
- Kotoba no Puzzle: Mojipittan DS (DS)
- Kotodama: The 7 Mysteries of Fujisawa (Switch)
- Kousoku Card Battle: Card Hero (DS)
- Krusty's Fun House (GB)
- Krusty's Fun House (SNES)
- Kunai (Switch eShop)
- Kung Fu Dragon (DSiWare)
- Kung Fu Fight (3DS eShop)
- Kung Fu FIGHT! (Wii U eShop)
- Kung Fu Funk (WiiWare)
- Kung Fu Panda (DS)
- Kung Fu Panda: Legendary Warriors (DS)
- Kung Fu Panda: Showdown of Legendary Legends (3DS)
- Kung Fu Panda: Showdown of Legendary Legends (Wii U)
- Kung Fu Rabbit (3DS eShop)
- Kung Fu Rabbit (Wii U eShop)
- Kung-Fu Heroes (NES)
- Kung-Fu Master (GB)
- Kunio no Oden (SNES)
- Kunio-kun Nekketsu Collection 1 (GBA)
- Kunio-kun Nekketsu Collection 2 (GBA)
- Kunio-kun Nekketsu Collection 3 (GBA)
- Kunio-kun Nekketsu Complete: Famicom Hen (3DS)
- Kunio-kun no Dodgeball da yo Zen'in Shūgō! (SNES)
- Kunio-kun no Nekketsu Soccer League (NES)
- Kunio-kun: The World Classics Collection (Switch)
- Kurikin Nano Island Story (DS)
- Kuru Kuru Kururin (GBA)
- Kurupoto Cool Cool Stars (DS)
- Kururin Squash! (GCN)
- kuso (Switch eShop)
- Kutar Apple (3DS eShop)
- Kutar Burger Factory (3DS eShop)
- Kutar Concert Staff (3DS eShop)
- Kutar End Credits (3DS eShop)
- Kutar Jump Rope (3DS eShop)
- Kutar Magic Ball (3DS eShop)
- Kutar Powder Factory (3DS eShop)
- Kutar Quiz (3DS eShop)
- Kutar Ski Lift (3DS eShop)
- Kutar Tube Rider (3DS eShop)
- Kwirk (GB)
- Kylie: Sing & Dance (Wii)
- Kyogeki Quartet Fighters (Switch eShop)
- Kyotokei (WiiWare)
- KYUB (Switch eShop)