| Iron Sight (2009) | 3,855,404 | 907 |
| Iron Sky: Invasion (2012) | 2,090,330 | 216 |
| Iron Snout (2014) | 9,680,445 | 1,396 |
| Iron Soldier (1989) | 1,052 | 3 |
| Iron Soldier (1994) | 81,209 | 73 |
| Iron Soldier 2 (1997) | 22,164 | 28 |
| Iron Soldier 3 (2000) | 66,242 | 57 |
| Iron Storm (1995) | 315,553 | 326 |
| Iron Storm (2002) | 1,368,623 | 1,038 |
| Iron Tank (1988) | 532,115 | 373 |
| Iron Trackers (1989) | 2,300 | 6 |
| Iron Trails: Outlaw Pursuit (2024) | 68,656 | 7 |
| Iron Village (2025) | 12,922 | 22 |
| Iron Warriors: T-72 Tank Commander (2004) | 213,409 | 31 |
| Iron Wings (2017) | 703,104 | 191 |
| IRON WORLD (2023) | 754,627 | 33 |
| Ironcast (2015) | 1,433,706 | 946 |
| Ironclad (1996) | 2,062,062 | 456 |
| Ironclad Tactics (2013) | 618,004 | 263 |
| Ironclads 2: Boshin War (2017) | 1,269 | 3 |
| Ironclads: American Civil War (2008) | 9,365 | 3 |
| Ironclads: High Seas (2009) | 51,312 | 3 |
| IronFall: Invasion (2015) | 1,125,491 | 344 |
| Ironheart (2020) | 17,714,163 | 767 |
| Ironlights (2020) | 516,469 | 225 |
| Ironsand (2026) | 13 | 1 |
| Ironseed (1994) | 8,946 | 38 |
| Ironseed 25th (2020) | 0 | 0 |
| Ironsight (2019) | 33,955,473 | 13,111 |
| IronWolf VR (2017) | 8,871,096 | 120 |
| Ironwood Conquest (2025) | 0 | 0 |
| Irony Curtain: From Matryoshka with Love (2019) | 517,595 | 604 |
| Irony Of Nightmare (2017) | 5,072,573 | 379 |
| Irotoridori No Sekai (2011) | 74,042 | 152 |
| Irrational Exuberance (2016) | 31,614 | 24 |
| Irritated Mind: Fear of Warehouse (2024) | 1,554,003 | 113 |
| Irritating Stick (1998) | 1,608,165 | 104 |
| Irukandji (2009) | 49,825 | 12 |
| Iruna Online (2008) | 7,800,247 | 6,617 |
| iRunner (2009) | 1,102 | 3 |
| IS Defense (2016) | 434,763 | 150 |
| Is this Game Trying to Kill Me? (2024) | 2,737,948 | 535 |
| Is This Seat Taken? (2025) | 82,956 | 30 |
| iS: internal section (1999) | 34,604 | 73 |
| Isabella: Chasing Shadows (2024) | 193 | 2 |
| Isaiah 188 (2023) | 0 | 0 |
| Isaki Shuugorou no Keiba Hisshou Gaku (1990) | 1,009 | 5 |
| Isekai Adventurer Guild (2026) | 35 | 1 |
| Isekai Cowboy (2023) | 766 | 5 |
| Isekai Frontier (2024) | 19 | 2 |
| ISEKAI FRONTLINE (2023) | 78,429 | 34 |
| Isekai Harem Quest: Love, Blades, and Power (2025) | 0 | 0 |
| Isekai Janken Hero (2023) | 2,769 | 6 |
| Isekai Mining Defense (2025) | 0 | 0 |
| ISEKAI QUEST (2020) | 20,945 | 38 |
| Isekai Rondo (2023) | 85,349 | 128 |
| Isekai Sex Boutique (2025) | 0 | 0 |
| Isekai Succubus ~My Genderbent Saga in Another World (2022) | 8,453 | 9 |
| Isekai Wet Dream (2025) | 1 | 1 |
| Isekai: Reincarnation in a New World (2020) | 0 | 0 |
| Isekaing: from zero to zero. (2024) | 979 | 6 |
| isekizima: Ruins and Tails Journey (2025) | 2,584 | 7 |
| Ishar 3: The Seven Gates of Infinity (1994) | 73,406 | 138 |
| Ishar: Legend of the Fortress (1992) | 89,682 | 237 |
| Ishido: The Way of Stones (1990) | 49,792 | 119 |
| Ishin no Arashi (1988) | 120,538 | 67 |
| Isis (1994) | 1,191,762 | 192 |
| Isla de la Muerte (2025) | 581 | 3 |
| Isla Sinaloa (2022) | 615,448 | 98 |
| The Island (1983) | 18,402,984 | 1,992 |
| ISLAND (2016) | 1,206,376 | 360 |
| The Island - Escape Room (2025) | 1,375 | 2 |
| Island 359 (2016) | 4,195,245 | 185 |
| Island Assault (2022) | 1,300,764 | 303 |
| Island Bender (2023) | 3,185 | 26 |
