| Idle Plant Game (2023) | 0 | 0 |
| Idle Police Tycoon - Cops Game (2020) | 215,738 | 253 |
| The Idle RPG (2010) | 9,192,071 | 8,155 |
| Idle Slayer (2020) | 10,780,425 | 1,485 |
| Idle Space Navy (2023) | 0 | 0 |
| Idle Space Raider (2019) | 6,547 | 8 |
| Idle Sphere (2024) | 414 | 4 |
| Idle Spiral (2022) | 145,217 | 109 |
| Idle Stellar (2024) | 401 | 2 |
| Idle Streaming Bonanza (2026) | 0 | 0 |
| Idle Tiers (2024) | 1,475 | 1 |
| Idle Tower Defense (2024) | 484,750 | 466 |
| Idle Trillionaire (2024) | 224 | 3 |
| The Idle Undead (2024) | 2,312 | 9 |
| Idle Warrior (2020) | 337,459 | 107 |
| Idle Wasteland (2021) | 15,253 | 72 |
| Idle Wizard (2019) | 114,612 | 260 |
| Idlenetics (2023) | 366 | 2 |
| Idol Death Game TV (2016) | 9,490,171 | 215 |
| Idol Hakkenden (1989) | 459,377 | 154 |
| Idol Hands 2 (2023) | 115,415 | 15 |
| Idol Hell (2023) | 1,198 | 9 |
| Idol Janshi Suchie-Pai III Remix (2007) | 8,397 | 9 |
| Idol Manager (2020) | 15,866,700 | 3,072 |
| Idola Phantasy Star Saga (2018) | 2,263,810 | 2,199 |
| Idolish7 (2015) | 4,725,223 | 978 |
| The Idolmaster 2 (2011) | 9,758,540 | 1,574 |
| The Idolmaster Cinderella Girls (2011) | 33,530,793 | 2,368 |
| The Idolmaster Cinderella Girls: Viewing Revolution (2016) | 552,466 | 47 |
| The Idolmaster Dearly Stars (2009) | 90,583 | 202 |
| The Idolmaster Live For You! (2008) | 463,879 | 106 |
| The Idolmaster One For All (2014) | 3,151,951 | 1,224 |
| The Idolmaster Platinum Stars (2016) | 7,742,299 | 4,587 |
| The Idolmaster Shiny Festa (2012) | 1,406,568 | 221 |
| The Idolmaster SP (2009) | 549,575 | 627 |
| The Idolmaster: Cinderella Girls Starlight Stage (2015) | 66,823,143 | 22,121 |
| The Idolmaster: Million Live! (2013) | 6,368,820 | 1,071 |
| The Idolmaster: Million Live! Theater Days (2017) | 45,350,369 | 50,505 |
| The Idolmaster: Must Songs (2015) | 557,530 | 324 |
| The Idolmaster: Shiny Colors (2018) | 52,313,913 | 11,659 |
| The Idolmaster: SideM (2014) | 37,450,984 | 734 |
| The Idolmaster: SideM Live on St@ge! (2017) | 1,399,800 | 85 |
| The Idolmaster: Stella Stage (2017) | 4,549,207 | 3,729 |
| idolYAKI: From Delinquents to Pop Stars (2021) | 0 | 0 |
| iDracula: Undead Awakening (2009) | 334,394 | 51 |
| iDrop Dead (2009) | 2,065 | 1 |
| IDUN - Frontline Survival (2025) | 167,397 | 77 |
| Idylls of the Lunar Maria (2024) | 18 | 1 |
| If Found... (2020) | 1,444,838 | 355 |
| If Fusion Were That Easy (2022) | 1,003 | 19 |
| If It Moves, Shoot It! (1988) | 27,044 | 19 |
| If It Please the Court (2021) | 0 | 0 |
| If My Heart Had Wings -Flight Diary- (2019) | 37,584 | 125 |
| If On A Winter's Night, Four Travelers (2021) | 709,098 | 498 |
| If The Dream Of Star (2024) | 0 | 0 |
| IF/A-18E Carrier Strike Fighter (1998) | 386 | 1 |
| IFSolitaire (2024) | 0 | 0 |
| IfSunSets (2024) | 1,792,751 | 1,134 |
| Iggle Pop! (2004) | 523,169 | 690 |
| Iggy's Reckin' Balls (1998) | 913,031 | 887 |
| IgKnight Food Fight (2020) | 47 | 1 |
| IgKnight Golf Defender (2019) | 1,066 | 5 |
| Ignatius (2020) | 1,184,888 | 183 |
| Igneous (2009) | 103,981 | 48 |
| Ignis (2024) | 1,087,320 | 284 |
| Ignis Universia: Eternal Sisters Saga (2019) | 2,569 | 30 |
| IGNISTONE (2023) | 37,042 | 140 |
| Ignite (2011) | 7,154,429 | 813 |
| Ignited Entry (2024) | 1,292,386 | 333 |
| Ignited in Cavern (2024) | 24 | 1 |
| Ignited Steel: Mech Tactics (2022) | 195,545 | 63 |
| Ignition (1997) | 386,981 | 196 |
| The Ignition Factor (1994) | 559,119 | 345 |
| Igor: Objective Uikokahonia (1994) | 30,148 | 54 |
| Igor: The Game (2008) | 239,775 | 35 |
