| KORG DS-10 Synthesizer (2008) | 231,615 | 38 |
| KORG Gadget VR (2023) | 15,411 | 29 |
| Korga's Arena (2024) | 32 | 1 |
| Korgan (2018) | 89,563 | 79 |
| Kori's Fable Visual Novel (2023) | 0 | 0 |
| Korlax Escape! (2023) | 0 | 0 |
| Koro Koro Puzzle Happy Panechu! (2002) | 47,999 | 17 |
| Korogashi Puzzle Katamari Damacy (2009) | 71,343 | 59 |
| KoroNeko (2024) | 11,195 | 12 |
| Koronis Rift (1985) | 34,905 | 34 |
| Kororinpa (2006) | 278,985 | 367 |
| Korter 1996 (2025) | 728 | 6 |
| Kortstrid (2023) | 74 | 3 |
| Korvae in space (2017) | 0 | 0 |
| Koshchei The Immortal (2025) | 0 | 0 |
| Kosmic Kanga (1984) | 7,357 | 12 |
| Kosmic Pirate (1983) | 41 | 2 |
| Kosmo Laika : Guide to Space (2021) | 7 | 1 |
| Kosmo Laika: Space and Beyond (2021) | 8 | 1 |
| Kosmo Skirmish (2024) | 0 | 0 |
| Kosmo Spin (2010) | 77,078 | 11 |
| Kosmokrats (2020) | 376,467 | 280 |
| Kosmos Connections (2021) | 2,250 | 12 |
| Kosodate Quiz: Motto My Angel (1999) | 1,048,191 | 178 |
| Kosodate Quiz: My Angel (1996) | 194,090 | 158 |
| Kosodate Quiz: My Angel 2 (1997) | 15,825 | 26 |
| Kosodate Quiz: My Angel 3 (1998) | 11,620 | 20 |
| Kota`s New Journey (2024) | 5 | 1 |
| Kotel Ne Gori: A Friend of Lena Boots (2020) | 4,949 | 18 |
| KóterGame (2018) | 233 | 1 |
| Koto Battle: Tengai no Moribito (2001) | 22,536 | 50 |
| Kotoba Dash (2026) | 0 | 0 |
| Kotoba no Puzzle Mojipittan Advance (2003) | 765 | 6 |
| Kotoba no Puzzle Mojipittan Daijiten (2004) | 30,365 | 48 |
| Kotoba no Puzzle: Moji Pittan Encore (2020) | 2,311,810 | 259 |
| Kotoba no Puzzle: Mojipittan (2003) | 192,089 | 38 |
| Kotoba no Puzzle: Mojipittan Wii Deluxe (2008) | 31,633 | 5 |
| Kotodama Diary (2020) | 13,363 | 29 |
| Kotodama: The 7 Mysteries of Fujisawa (2019) | 261,943 | 550 |
| The Kotonoha Sisters and the Legend of Lysant Island (2021) | 1,315 | 6 |
| Kou-Kyou-Sei Million Arthur (2018) | 241,048 | 46 |
| Kouashi Kikou Shidan: Bein Panzer (2000) | 45,289 | 3 |
| Koudelka (1999) | 3,359,426 | 3,847 |
| Koufuku wo Yobu Game: Dora Dora Dora (1991) | 156 | 1 |
| Koumajou Densetsu II: Stranger's Requiem (2010) | 2,491,534 | 750 |
| Koumajou Densetsu: Scarlet Symphony (2009) | 2,002,331 | 955 |
| Koumajou Remilia Ⅱ: Stranger's Requiem (2023) | 22,617 | 78 |
| Koumajou Remilia: Scarlet Symphony (2022) | 630,129 | 772 |
| Kousoku Card Battle: Card Hero (2007) | 67,353 | 50 |
| Kousoku Shikou Shogi-Oh (1995) | 31 | 2 |
| Koutetsu no Kishi (1991) | 120,275 | 77 |
| Koutetsu no Kishi 2: Sabaku no Rommel Shougun (1994) | 238 | 5 |
| Koutetsu no Kishi 3: Gekitotsu Europe Sensen (1995) | 600 | 6 |
| Koutetsu Yousai Strahl (1992) | 103,941 | 93 |
| Koutetsujou no Kabaneri -Ran- Hajimaru Kiseki (2018) | 951 | 4 |
| KovaaK 2.0 (2018) | 769,123 | 493 |
| KovaaK's (2018) | 22,925,301 | 6,626 |
| Koverpark Haunted Subway (2024) | 0 | 0 |
| Kovoclak (2024) | 367 | 5 |
| Kowa-Oto (2010) | 5,879 | 1 |
| Kowi Ishto: Battle of Akonoli (2020) | 0 | 0 |
| Kowloon High-School Chronicle (2004) | 870,077 | 1,215 |
| Kowloon's Gate (1997) | 1,704,720 | 572 |
| Kozmik Krooz'r (1982) | 12,121 | 28 |
| Kozomo: The Smoldering Ember (2025) | 0 | 0 |
| KrabbitWorld Labyrinth (2006) | 182 | 2 |
| KrabbitWorld Origins (2009) | 0 | 0 |
| Krai Mira (2016) | 195,617 | 94 |
| Kraino ReAnimated (2023) | 23,049 | 44 |
| Krakatoa (1984) | 4,669,140 | 104 |
| Kraken Academy!! (2021) | 1,303,865 | 1,164 |
| The Kraken Wakes (2023) | 74,840 | 50 |
| Krakout (1987) | 121,272 | 124 |
| Krakout Unlimited (2002) | 5,315 | 3 |
| Kraktures (2025) | 0 | 0 |
