| Karnov (1987) | 3,183,579 | 1,248 |
| Karnov's Revenge (1994) | 7,203,118 | 3,057 |
| Karos Online (2010) | 17,555,930 | 5,043 |
| Karoshi 2.0 (2008) | 66,851 | 19 |
| Karoshi Factory (2008) | 11,624 | 14 |
| Karoshi: Suicide Salaryman (2008) | 260,804 | 66 |
| Karous (2006) | 147,684 | 160 |
| Karpatia: Order Of The Comet (2024) | 0 | 0 |
| Karryn's Prison (2021) | 279,288 | 44 |
| Kart Evolution 2025 (2025) | 41 | 2 |
| Kart Fighter (1993) | 2,148,788 | 308 |
| Kart Kids (2020) | 94,712 | 70 |
| Kart Racing Pro (2017) | 815,586 | 183 |
| Kartia: The Word of Fate (1998) | 261,327 | 351 |
| Karting Grand Prix (1988) | 448,727 | 12 |
| Karting of Banban (2025) | 163,778 | 7 |
| Karting Superstars (2023) | 65,504 | 138 |
| KartKraft (2022) | 2,631,767 | 506 |
| KartMania Silver (2024) | 574 | 7 |
| KartRider: Drift (2021) | 5,028,347 | 4,459 |
| KartRider: Drift (2022) | 15,257,008 | 3,328 |
| Karvan (2023) | 701 | 3 |
| Karyssia: Queen of Diamonds (1987) | 763 | 2 |
| Kasiori (2021) | 21,196 | 57 |
| Kaskade (2025) | 395,440 | 44 |
| Kasparov Chessmate (2003) | 16,162 | 36 |
| Kasparov's Gambit (1993) | 7,730 | 7 |
| Kassei - Road Cycling (2024) | 0 | 0 |
| Kasumi Ninja (1994) | 1,567,086 | 181 |
| Kasumi VS Mai (2024) | 0 | 0 |
| Kat Trap (1987) | 2,281 | 10 |
| Kat's Run: All Japan K-Car Championship (1995) | 126,960 | 56 |
| Katabasis (2012) | 109,858 | 32 |
| Katakis (1988) | 224,839 | 161 |
| Katamari Amore (2011) | 169,803 | 117 |
| Katamari Damacy (2004) | 51,791,696 | 6,471 |
| Katamari Damacy Mobile (2007) | 33,240 | 18 |
| Katamari Damacy Reroll (2018) | 20,430,815 | 8,103 |
| Katamari Forever (2009) | 31,010,416 | 2,319 |
| Katana Arena (2024) | 44 | 4 |
| KATANA KAMI: A Way of the Samurai Story (2020) | 6,052,186 | 1,455 |
| Katana Rama (2023) | 4,862 | 30 |
| Katana Zero (2019) | 60,890,963 | 15,532 |
| Katana's Path (2024) | 734 | 3 |
| Katawa Shoujo (2012) | 19,424,766 | 8,302 |
| Kate Arrow: Deserted Wood (2010) | 27,170 | 17 |
| Kate: Collateral Damage (2021) | 13,287 | 20 |
| Katharsis (1997) | 7,216 | 6 |
| Katharsis (2017) | 2,046,394 | 40 |
| Kathy Rain (2016) | 3,758,632 | 3,625 |
| Katie (2018) | 87,615,656 | 369 |
| Katja's Abyss: Tactics (2021) | 710 | 9 |
| Katsuya Onizuka Super Virtual Boxing (1993) | 0 | 0 |
| Katy and Bob: Safari Cafe (2018) | 12,878 | 80 |
| Kautic - The Bald Wizard (2017) | 282 | 6 |
| KAVERNUM (2025) | 27,332 | 15 |
| Kawa no Nushi Tsuri (1990) | 30,145 | 43 |
| Kawa no Nushi Tsuri 2 (1995) | 18,677 | 42 |
| Kawaii Asian Girls (2024) | 8,610 | 11 |
| Kawaii Deathu Desu (2019) | 98,511 | 480 |
| Kawaii Girls (2021) | 3,016,396 | 101 |
| Kawaii Koinu: Wonderful (2004) | 52,840 | 16 |
| Kawaii Koneko DS (2008) | 437 | 5 |
| Kawaii Neko Girls (2021) | 9,940 | 15 |
| Kawaii Neko Girls 2 (2023) | 1,070 | 6 |
| Kawasaki Caribbean Challenge (1993) | 13,494 | 54 |
| Kawasaki Fantasy Motocross (2001) | 6,051 | 4 |
| Kawasaki Jet Ski (2007) | 75,505 | 23 |
| Kawasaki Quad Bikes (2007) | 60,908 | 25 |
| Kawasaki Snowmobiles (2008) | 66,977 | 13 |
| Kawasaki Superbike Challenge (1994) | 256,463 | 203 |
| Kay's Destiny (2023) | 3,143 | 22 |
| Kaya Joshi: Magical Detective (2023) | 4,203 | 7 |
| Kaya's Prophecy (2025) | 50,319 | 43 |
| Kayak VR: Mirage (2022) | 3,637,007 | 1,043 |
