| Imperial Glory (2005) | 785,936 | 532 |
| Imperial Grace (2025) | 190 | 8 |
| Imperial SaGa (2015) | 3,847,042 | 1,755 |
| Imperial SaGa Eclipse (2019) | 64,563 | 190 |
| Imperial Settlers: Imperial Miners (2024) | 0 | 1 |
| Imperial Storm (2024) | 5,956 | 3 |
| Imperialism (1997) | 33,752,854 | 442 |
| Imperialism II: Age of Exploration (1999) | 380,705 | 363 |
| Imperialism: Concert of Europe (2024) | 0 | 0 |
| Imperishable Memories (2018) | 317 | 10 |
| Imperishable Night (2004) | 96,153,896 | 9,078 |
| Imperium (1990) | 21,460,548 | 2,062 |
| Imperium (1992) | 289,891 | 351 |
| Imperium AO (2004) | 74,398 | 113 |
| Imperium Galactic War (2013) | 55,694 | 33 |
| Imperium Galactica (1997) | 566,959 | 455 |
| Imperium Galactica II: Alliances (1999) | 749,104 | 525 |
| Imperium Galactum (1984) | 2,491 | 5 |
| Imperium Romanum (2008) | 1,301,256 | 637 |
| Imperiums: Greek Wars (2020) | 1,086,896 | 828 |
| Imperivm: Great Battles of Rome (2005) | 2,059,416 | 844 |
| IMPETUM (2024) | 468 | 6 |
| Impire (2013) | 1,688,855 | 663 |
| Implements of Hell (2021) | 1,115,523 | 250 |
| Implosion (1987) | 15,442,328 | 435 |
| Implosion: Never Lose Hope (2015) | 4,616,935 | 1,535 |
| Import Tuner Challenge (2006) | 1,262,725 | 1,001 |
| Important People of History: Presidents - Abraham Lincoln (2026) | 0 | 0 |
| Important People of History: Presidents - George Washington (2026) | 0 | 0 |
| Important People of History: Presidents - Thomas Jefferson (2026) | 0 | 0 |
| Impossaball (1987) | 5,010 | 23 |
| Impossamole (1990) | 91,948 | 134 |
| Impossiball - Gamers Challenge (2019) | 28,198 | 7 |
| Impossible Creatures (2003) | 14,284,338 | 1,665 |
| The Impossible Dungeon (2012) | 169,938 | 60 |
| The Impossible Game (2009) | 213,245,248 | 4,176 |
| The Impossible Knight Runner (2022) | 42 | 1 |
| Impossible Maze (2020) | 160,077,877 | 128 |
| Impossible Mission (1984) | 6,882,295 | 480 |
| Impossible Mission (2007) | 162,437 | 44 |
| Impossible Mission 2025 (1994) | 33,254 | 43 |
| Impossible Mission II (1988) | 237,727 | 171 |
| Impossible Pixels (2021) | 73,014 | 16 |
| Impossible Slasher! Hack and Slash (2022) | 195 | 7 |
| Impossible Spell Card (2014) | 2,325,627 | 1,767 |
| ImpossiBowl (2023) | 66 | 2 |
| Impostor Factory (2021) | 3,165,410 | 2,563 |
| Impostor Hunter: Zombieland (2022) | 22,149 | 21 |
| Impostor Legends (2021) | 707,449 | 53 |
| Imprecision (2023) | 0 | 0 |
| The Impregnation of the Elves: Conquest of the Arrogant Fairies by Impregnation (2022) | 5,568 | 2 |
| Impresja (2017) | 2,153 | 12 |
| imprint-X (2017) | 10,267 | 27 |
| Imprisoned Hyperion (2022) | 4,834 | 32 |
| Imprisoned Light (2016) | 26,079 | 29 |
| Improbability Control Bureau (2024) | 105 | 5 |
| Impromptu Vector Field Painter (2017) | 0 | 0 |
| The Improv Presents: Don't Quit Your Day Job (1996) | 133,383 | 13 |
| Impulse Revolution (2015) | 441 | 5 |
| Impulse Rogue (2024) | 18 | 2 |
| Impulsion (2018) | 2,854,731 | 165 |
| Impulsow (2018) | 19 | 2 |
| Imscared (2016) | 38,580,639 | 1,724 |
| Imscared - A Pixelated Nightmare (2012) | 15,372,367 | 323 |
| In & Out Alive (2023) | 0 | 0 |
| In a World After People (2026) | 35 | 1 |
| In Another Brothel (2010) | 220 | 1 |
| In Between (2015) | 6,983,145 | 660 |
| In Between Games (2018) | 14,087 | 32 |
| In Case of Emergency, Release Raptor (2016) | 311,916 | 104 |
| In Celebration of Violence (2018) | 226,973 | 297 |
| In Cold Blood (2000) | 2,538,120 | 480 |
| In Cubation (2007) | 290,856 | 126 |
| In da Hoop! (2021) | 19,572 | 39 |
| In Death (2018) | 3,298,993 | 1,116 |
