| Karos Online (2010) | 17,314,755 | 4,854 |
| Karoshi 2.0 (2008) | 66,851 | 19 |
| Karoshi Factory (2008) | 11,624 | 14 |
| Karoshi: Suicide Salaryman (2008) | 260,792 | 66 |
| Karous (2006) | 140,843 | 154 |
| Karpatia: Order Of The Comet (2024) | 0 | 0 |
| Karryn's Prison (2021) | 0 | 0 |
| Kart Fighter (1993) | 2,124,229 | 301 |
| Kart Kids (2020) | 94,665 | 69 |
| Kart Racing Pro (2017) | 814,140 | 176 |
| Kartia: The Word of Fate (1998) | 261,199 | 344 |
| Karting Grand Prix (1988) | 448,727 | 12 |
| Karting of Banban (2025) | 158,557 | 7 |
| Karting Superstars (2023) | 64,833 | 136 |
| KartKraft (2022) | 2,627,377 | 503 |
| KartMania Silver (2024) | 574 | 7 |
| KartRider: Drift (2021) | 5,012,114 | 4,457 |
| KartRider: Drift (2022) | 15,255,377 | 3,326 |
| Karvan (2023) | 0 | 0 |
| Karyssia: Queen of Diamonds (1987) | 763 | 2 |
| Kasiori (2021) | 21,183 | 57 |
| Kaskade (2025) | 393,307 | 43 |
| Kasparov Chessmate (2003) | 16,098 | 36 |
| Kasparov's Gambit (1993) | 7,655 | 7 |
| Kassei - Road Cycling (2024) | 0 | 0 |
| Kasumi Ninja (1994) | 1,561,990 | 175 |
| Kasumi VS Mai (2024) | 0 | 0 |
| Kat Trap (1987) | 2,281 | 10 |
| Kat's Run: All Japan K-Car Championship (1995) | 126,861 | 54 |
| Katabasis (2012) | 108,636 | 31 |
| Katakis (1988) | 224,758 | 160 |
| Katamari Amore (2011) | 169,678 | 116 |
| Katamari Damacy (2004) | 50,633,638 | 6,300 |
| Katamari Damacy Mobile (2007) | 0 | 0 |
| Katamari Damacy Reroll (2018) | 20,041,531 | 7,944 |
| Katamari Forever (2009) | 31,042,711 | 2,295 |
| Katana Arena (2024) | 44 | 4 |
| KATANA KAMI: A Way of the Samurai Story (2020) | 6,052,155 | 1,455 |
| Katana Rama (2023) | 4,861 | 30 |
| Katana Zero (2019) | 60,495,962 | 15,316 |
| Katana's Path (2024) | 734 | 3 |
| Katawa Shoujo (2012) | 19,412,806 | 8,256 |
| Kate Arrow: Deserted Wood (2010) | 27,170 | 17 |
| Kate: Collateral Damage (2021) | 13,287 | 20 |
| Katharsis (1997) | 7,216 | 6 |
| Katharsis (2017) | 2,046,379 | 39 |
| Kathy Rain (2016) | 3,727,949 | 3,477 |
| Katie (2018) | 87,054,165 | 364 |
| 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) | 30,113 | 43 |
| Kawa no Nushi Tsuri 2 (1995) | 0 | 0 |
| Kawaii Asian Girls (2024) | 8,610 | 11 |
| Kawaii Deathu Desu (2019) | 98,462 | 474 |
| Kawaii Girls (2021) | 0 | 0 |
| Kawaii Koinu: Wonderful (2004) | 0 | 0 |
| Kawaii Koneko DS (2008) | 0 | 0 |
| Kawaii Neko Girls (2021) | 9,940 | 15 |
| Kawaii Neko Girls 2 (2023) | 1,070 | 6 |
| Kawasaki Caribbean Challenge (1993) | 12,202 | 52 |
| Kawasaki Fantasy Motocross (2001) | 6,051 | 4 |
| Kawasaki Jet Ski (2007) | 75,273 | 23 |
| Kawasaki Quad Bikes (2007) | 60,908 | 25 |
| Kawasaki Snowmobiles (2008) | 66,977 | 13 |
| Kawasaki Superbike Challenge (1994) | 256,196 | 202 |
| Kay's Destiny (2023) | 3,143 | 22 |
| Kaya Joshi: Magical Detective (2023) | 4,203 | 7 |
| Kaya's Prophecy (2025) | 50,308 | 42 |
| Kayak VR: Mirage (2022) | 3,634,170 | 1,014 |
| Kayleth (1986) | 75,732 | 9 |
| Kaz's Adventure (2022) | 0 | 0 |
| Kaz's Adventure 2: Lost Souls (2023) | 1,406 | 26 |
