| 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) | 703,103 | 191 |
| IRON WORLD (2023) | 754,627 | 33 |
| Ironcast (2015) | 1,433,603 | 943 |
| Ironclad (1996) | 1,916,130 | 436 |
| Ironclad Tactics (2013) | 617,996 | 262 |
| 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) | 17,293,789 | 762 |
| Ironlights (2020) | 515,512 | 225 |
| Ironseed (1994) | 8,946 | 38 |
| Ironseed 25th (2020) | 0 | 0 |
| Ironsight (2019) | 33,954,700 | 13,111 |
| IronWolf VR (2017) | 8,871,092 | 120 |
| Irony Curtain: From Matryoshka with Love (2019) | 517,433 | 604 |
| Irony Of Nightmare (2017) | 5,072,529 | 379 |
| Irotoridori No Sekai (2011) | 73,976 | 152 |
| Irrational Exuberance (2016) | 31,614 | 24 |
| Irritated Mind: Fear of Warehouse (2024) | 1,554,003 | 113 |
| Irritating Stick (1998) | 1,608,156 | 104 |
| Irukandji (2009) | 49,825 | 12 |
| Iruna Online (2008) | 7,793,854 | 6,614 |
| iRunner (2009) | 1,102 | 3 |
| IS Defense (2016) | 434,761 | 150 |
| Is this Game Trying to Kill Me? (2024) | 2,737,765 | 532 |
| iS: internal section (1999) | 34,577 | 72 |
| Isabella: Chasing Shadows (2024) | 193 | 2 |
| Isaiah 188 (2023) | 0 | 0 |
| Isaki Shuugorou no Keiba Hisshou Gaku (1990) | 1,009 | 5 |
| Isekai Cowboy (2023) | 766 | 5 |
| Isekai Frontier (2024) | 19 | 2 |
| ISEKAI FRONTLINE (2023) | 78,429 | 34 |
| Isekai Janken Hero (2023) | 2,769 | 6 |
| ISEKAI QUEST (2020) | 20,897 | 38 |
| Isekai Rondo (2023) | 85,295 | 128 |
| 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) | 978 | 6 |
| isekizima: Ruins and Tails Journey (2025) | 75 | 6 |
| Ishar 3: The Seven Gates of Infinity (1994) | 73,390 | 138 |
| Ishar: Legend of the Fortress (1992) | 89,535 | 237 |
| Ishido: The Way of Stones (1990) | 49,759 | 118 |
| Ishin no Arashi (1988) | 120,319 | 67 |
| Isis (1994) | 1,189,954 | 191 |
| Isla de la Muerte (2025) | 581 | 3 |
| Isla Sinaloa (2022) | 615,448 | 98 |
| The Island (1983) | 18,156,870 | 1,939 |
| ISLAND (2016) | 1,206,371 | 360 |
| The Island - Escape Room (2025) | 1,358 | 1 |
| Island 359 (2016) | 4,195,244 | 185 |
| Island Assault (2022) | 1,300,117 | 301 |
| Island Bender (2023) | 3,185 | 26 |
| Island Clicker (2024) | 12,916 | 16 |
| The Island Combat (2021) | 4,929 | 24 |
| Island Dash (2017) | 0 | 0 |
| Island Days (2014) | 187,630 | 111 |
| Island Defender Jets (2022) | 0 | 0 |
| Island Flight Simulator (2015) | 776,319 | 118 |
| Island Hopper (1998) | 9,153,517 | 233 |
| Island Idle RPG (2022) | 226,238 | 11 |
| Island Keeper (2025) | 224 | 3 |
| Island Master (2023) | 29,971 | 80 |
| Island Notes (2025) | 377,900 | 116 |
| Island of Aito (2022) | 901 | 7 |
| The Island of Dr. Brain (1992) | 170,935 | 202 |
| Island of the Ancients (2022) | 17,862 | 36 |
| Island of the Lost (2021) | 130,185 | 129 |
| Island of Winds (2025) | 335,538 | 83 |
| Island Peril (1996) | 804,251 | 29 |
| Island Saver (2020) | 33,382,973 | 4,126 |
