- K-1 Pocket Grand Prix (GBA)
- K-1 Pocket Grand Prix 2 (GBA)
- 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)
- Kaichu: The Kaiju Dating Sim (Switch eShop)
- Kaiju Busters (DS)
- Kaiju Khaos (Switch eShop)
- Kaiju Wars (Switch eShop)
- KAIO: King of Pirates (3DS)
- Kairobotica (Switch eShop)
- Kaite Tsukutte Asoberu Dezaemon (SNES)
- Kakurasu World (Switch eShop)
- Kakuro by Nikoli (3DS eShop)
- Kakuro Magic (Switch eShop)
- Kamen Rider Battle Ganbaride: Card Battle Taisen (DS)
- Kamen Rider: Dragon Knight (DS)
- KAMI (3DS eShop)
- Kamikaze Veggies (Switch eShop)
- Kamiko (Switch eShop)
- Kamiwaza Tourai (Switch eShop)
- Kamiwaza: Way of the Thief (Switch eShop)
- Kanji Sonomama Rakubiki Jiten (DS)
- Kanjozoku Game レーサー - Car Racing & Highway Driving Simulator Games (Switch eShop)
- Kansei: The Second Turn HD (Switch eShop)
- Kao the Kangaroo (Switch)
- Kao the Kangaroo Round 2 (GCN)
- Kaptain Brawe: A Brawe New World (Switch eShop)
- Karaoke Revolution Party (GCN)
- Karate Champ (NES)
- Karate Phants: Gloves of Glory (WiiWare)
- Karateka (Wii U eShop)
- Kardboard Kings (Switch eShop)
- Karma Knight (Switch eShop)
- Karma. Incarnation 1 (Switch eShop)
- Karnov's Revenge (Neo Geo)
- Karous -The Beast of Re:Eden- (3DS eShop)
- Kart Crazy Race Simulator Game (Switch eShop)
- Kart Krashers (DSiWare)
- Kartoon Racing: Singleplayer Multiplayer Racing (Switch eShop)
- Kasiori (Switch eShop)
- Katamari Damacy REROLL (Switch eShop)
- KATANA KAMI: A Way of the Samurai Story (Switch eShop)
- Katana Kata (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)
- Kathy Rain (Switch eShop)
- Kathy Rain: Director's Cut (Switch eShop)
- Kattish (Switch eShop)
- Kauil’s Treasure (Switch eShop)
- Kawaii Deathu Desu (Switch eShop)
- Kawaii Slime Arena (Switch eShop)
- Kawaii Solitaire 3 in 1 (Switch eShop)
- Kayko & Kokosh Coloring Book (Switch eShop)
- Kaze and the Wild Masks (Switch)
- Keen - One Girl Army (Switch eShop)
- Keen: One Girl Army (Switch eShop)
- Keep Talking And Nobody Explodes (Switch eShop)
- Keep the Balance (GBC)
- Kells (Switch eShop)
- Kelly Club: Clubhouse Fun (GBC)
- 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 Follett's The Pillars of the Earth (Switch eShop)
- Ken Griffey Jr.'s Slugfest (GBC)
- Ken Griffey, Jr. Presents Major League Baseball (GB)
- Ken Griffey, Jr.'s Slugfest (N64)
- 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)
- Keylocker (Switch eShop)
- KEYTARI: 8-bit Music Maker (Wii U eShop)
- KeyWe (Switch eShop)
- Kharon's Crypt - Even Death May Die (Switch eShop)
- Kholat (Switch eShop)
- Ki11er Clutter (Switch eShop)
- Kiai Resonance (Switch eShop)
- Kick & Fennick (Wii U eShop)
- Kick Master (NES)
- Kick Off 3: European Challenge (SNES)
- KickBeat: Special Edition (Wii U eShop)
- Kickerinho World (Switch eShop)
- Kickle Cubicle (NES)
- Kid Adventures: Sky Captain (Wii)
- Kid Ball Adventure (Switch 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 Niki: Radical Ninja (NES)
- Kid Tripp (3DS eShop)
- Kid Tripp (Switch eShop)
- Kid's Art & Puzzle (Switch eShop)
- Kid's Art Coloring Book (Switch eShop)
- Kid? Senshi Gundam: Gundam vs. Z Gundam (GCN)
- Kid? Senshi Gundam: Senshitachi no Kiseki (GCN)
- Kiddy Memory (Switch eShop)
- Kidou Gekidan Haro Ichiza: Haro no Puyo Puyo (GBA)
- Kids Box (Switch eShop)
- Kids Party Checkers (Switch eShop)
- Kids Puzzle - 2 in 1 Bundle (Switch eShop)
- Kids Vs Parents (Switch eShop)
- Kids: Farm Coloring (Switch eShop)
- Kids: Farm Colouring (Switch eShop)
- Kids: Farm Puzzle (Switch eShop)
- Kids: ZOO Puzzle (Switch eShop)
- Kidz Bop Dance Party! The Video Game (Wii)
- Kill It With Fire (Switch eShop)
- Kill la Kill: IF (Switch)
- Kill Switch (GBA)
- Kill The Bad Guy (Switch eShop)
- Killer Chambers (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)
- Kindergarten Buddy Edition (Switch eShop)
- Kinduo (Switch eShop)
- Kine (Switch eShop)
- King Arthur (GCN)
- King Leo (Switch eShop)
- King Lucas (Switch eShop)
- King Oddball (Switch eShop)
- King of Clubs (DS)
- King of Fighters 2001 (Neo Geo)
- King of Fighters Collection: The Orochi Saga (Wii)
- King of Fighters R-2 (Switch eShop)
- King of Seas (Switch eShop)
- King of the Hat (Switch eShop)
- King of the Monsters (Neo Geo)
- King of the Monsters 2 (Neo Geo)
- King's Bounty II (Switch)
- King's Knight (NES)
- King's Quest V: Absence Makes the Heart Go Yonder! (NES)
- Kingdom Come: Deliverance (Switch eShop)
- Kingdom Crusade (GB)
- Kingdom Eighties (Switch eShop)
- Kingdom Hearts - HD 1.5 + 2.5 ReMix - Cloud Version (Switch eShop)
- Kingdom Hearts 358/2 Days (DS)
- Kingdom Hearts 3D: Dream Drop Distance (3DS)
- Kingdom Hearts HD 2.8 Final Chapter Prologue - Cloud Version (Switch eShop)
- Kingdom Hearts III + Re Mind - Cloud Version (Switch eShop)
- KINGDOM HEARTS INTEGRUM MASTERPIECE for Cloud (Switch eShop)
- Kingdom Hearts Re:coded (DS)
- Kingdom Hearts: Chain Of Memories (GBA)
- Kingdom Hearts: Melody of Memory (Switch)
- Kingdom Majestic (Switch eShop)
- Kingdom of Arcadia (Switch eShop)
- Kingdom Rush (Switch eShop)
- Kingdom Rush Frontiers (Switch eShop)
- Kingdom Rush Origins (Switch eShop)
- Kingdom Tales (Switch eShop)
- Kingdom Tales 2 (Switch eShop)
- Kingdom Two Crowns (Switch eShop)
- Kingdom's Item Shop (3DS eShop)
- Kingdom: New Lands (Switch eShop)
- Kingdoms of Amalur: Re-Reckoning (Switch)
- Kingmaker: Rise to the Throne (Switch eShop)
- Kings of Paradise (Switch eShop)
- Kira Kira Pop Princess (DS)
- Kira tto Kaiketsu! 64 Tanteidan (N64)
- Kirakira stars idol project Ai (Switch eShop)
- Kirakira stars idol project Memories (Switch eShop)
- Kirakira stars idol project Nagisa (Switch eShop)
- Kirakira stars idol project Reika (Switch eShop)
- Kirby & The Amazing Mirror (GBA)
- Kirby 64: The Crystal Shards (N64)
- Kirby Air Ride (GCN)
- Kirby and the Forgotten Land (Switch)
- Kirby and the Rainbow Curse (Wii U)
- Kirby Battle Royale (3DS)
- Kirby Fighters 2 (Switch eShop)
- 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 Buffet (Switch 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 Return to Dream Land Deluxe (Switch)
- Kirby's Star Stacker (GB)
- Kirby: Canvas Curse (DS)
- Kirby: Nightmare in Dream Land (GBA)
- Kirby: Planet Robobot (3DS)
- Kirby: Triple Deluxe (3DS)
- Kirikou (GBC)
- Kissed by the Baddest Bidder (Switch eShop)
- Kitaria Fables (Switch)
- Kitori Academy (Switch eShop)
- Kitsune Tails (Switch eShop)
- Kitten Squad (Switch eShop)
- Kitten's Head Football (Switch eShop)
- Kittens and Yarn (Switch eShop)
- Kitty Love -Way to look for love- (Switch eShop)
- Kitty Maestro (Switch eShop)
- Kitty Powers' Matchmaker (Switch eShop)
- Kitty Rainbow (Switch eShop)
- Kity Builder (Switch eShop)
- Kiwame Mahjong DX2 (GCN)
- Kizuna Encounter (Neo Geo)
- Klang 2 (Switch eShop)
- Klax (GB)
- Klax (GBC)
- Klax (NES)
- Klondike Solitaire (Switch eShop)
- Klondike Solitaire Collection (Switch eShop)
- Klonoa (Wii)
- Klonoa 2: Dream Champ Tournament (GBA)
- KLONOA Phantasy Reverie Series (Switch)
- Klonoa: Empire of Dreams (GBA)
- Klustar (GBC)
- Knife Edge: Nose Gunner (N64)
- KnifeBoy Rebooted (Switch eShop)
- Knight Quest (GB)
- Knight Squad (Switch eShop)
- Knight Squad 2 (Switch eShop)
- Knight Swap (Switch eShop)
- Knight Swap 2 (Switch eShop)
- Knight Terrors (Switch eShop)
- Knight with Tactics (Switch eShop)
- Knight's Castle - Medieval Minigames for Toddlers and Kids (Switch eShop)
- Knight's Retreat (Switch eShop)
- Knight's Try (Switch eShop)
- Knightin'+ (Switch eShop)
- KnightOut (Switch eShop)
- Knights & Guns (Switch eShop)
- Knights and Bikes (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 City (Switch eShop)
- Knockout City™ Cross-Play Beta (Switch eShop)
- Knockout Home Fitness (Switch)
- Knockout Kings (GBC)
- Knockout Kings 2000 (N64)
- Knockout Kings 2003 (GCN)
- Know by heart... (Switch eShop)
- Know Your Friends (Wii U)
- Knowledge Trainer: Trivia (Switch eShop)
- Knytt Underground (Wii U eShop)
- Koa and the Five Pirates of Mara (Switch eShop)
- Kobe Bryant in NBA Courtside (N64)
- Koe de Asobou! HeartCatch PreCure! (DS)
- Kofi Quest (Switch eShop)
- Koi DX (Switch eShop)
- Koi DX (Wii U eShop)
- Kokopa's Atlas (Switch eShop)
- KOKORO CLOVER Season 1 (Switch eShop)
- Kokuga (3DS eShop)
- Koloro (Switch eShop)
- Kolumno (Switch eShop)
- Kombinera (Switch eShop)
- Kona (Switch eShop)
- Konami Classics Series: Arcade Hits (DS)
- Konami Collector's Series: Arcade Advanced (GBA)
- Konami GB Collection Vol.1 (GBC)
- Konami GB Collection Vol.2 (GBC)
- Konami GB Collection Vol.3 (GBC)
- Konami GB Collection Vol.4 (GBC)
- 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)
- Kontrakt (Switch eShop)
- 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)
- Kosmokrats (Switch eShop)
- Kosmonavtes: Academy Escape (Switch eShop)
- Kosmonavtes: Escape Reality (Switch eShop)
- Kotoba no Puzzle: Mojipittan DS (DS)
- Kotodama: The 7 Mysteries of Fujisawa (Switch)
- Koumajou Densetsu: Scarlet Symphony (Switch eShop)
- Koumajou Remilia II: Stranger's Requiem (Switch eShop)
- Koumajou Remilia: Scarlet Symphony (Switch eShop)
- Kousoku Card Battle: Card Hero (DS)
- Kowloon High-School Chronicle (Switch eShop)
- Kraino Origins (Switch eShop)
- Kraken Academy!! (Switch eShop)
- Kraken Smash: Volleyball (Switch eShop)
- Krispain Hero:Roguelite Dungeon Shooter Fire Simulator Counter FPS World (Switch eShop)
- KRTL: Jay und Die Spielzeugdiebe (GBC)
- Krusty's Fun House (GB)
- Krusty's Fun House (NES)
- Krusty's Super Fun House (SNES)
- Krut: The Mythic Wings (Switch eShop)
- Krystopia: A Puzzle Journey (Switch eShop)
- Kubi Adventures (Switch eShop)
- Kubinashi Recollection (Switch eShop)
- KukkoroDays (Switch eShop)
- Kukoos: Lost Pets (Switch)
- Kulebra and the Souls of Limbo (Switch eShop)
- Kunai (Switch eShop)
- Kung Fu (NES)
- 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 Fury: Street Rage - Ultimate Edition (Switch eShop)
- Kung-Fu Heroes (NES)
- Kung-Fu Master (GB)
- KungFu Kickball (Switch eShop)
- 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)
- Kurokami-sama's Feast (Switch eShop)
- KURSK (Switch eShop)
- 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)
- KUUKIYOMI 2: Consider It More! - New Era (Switch eShop)
- KUUKIYOMI 3: Consider It More and More!! - Father to Son (Switch eShop)
- KUUKIYOMI: Consider It! (Switch eShop)
- Kwaidan ～Azuma manor story～ (Switch eShop)
- Kwirk (GB)
- Kyle is Famous: Complete Edition (Switch eShop)
- Kylie: Sing & Dance (Wii)
- Kyogeki Quartet Fighters (Switch eShop)
- Kyotokei (WiiWare)
- KYUB (Switch eShop)