| Idle Miner Tycoon: Gold Games (2016) | 2,360,286 | 132 |
| Idle Miner Tycoon: Money Games (2016) | 524 | 16 |
| Idle Monkeylogy (2021) | 1,033 | 6 |
| Idle Plant Game (2023) | 0 | 0 |
| Idle Police Tycoon - Cops Game (2020) | 216,234 | 252 |
| The Idle RPG (2010) | 9,313,994 | 8,615 |
| Idle Slayer (2020) | 13,912,249 | 1,592 |
| Idle Space Navy (2023) | 0 | 0 |
| Idle Space Raider (2019) | 6,547 | 8 |
| Idle Sphere (2024) | 414 | 4 |
| Idle Spiral (2022) | 145,219 | 110 |
| Idle Stellar (2024) | 401 | 2 |
| Idle Streaming Bonanza (2026) | 0 | 0 |
| Idle Tiers (2024) | 1,475 | 1 |
| Idle Tower Defense (2024) | 518,523 | 526 |
| Idle Trillionaire (2024) | 224 | 3 |
| The Idle Undead (2024) | 2,312 | 9 |
| Idle Warrior (2020) | 337,459 | 107 |
| Idle Wasteland (2021) | 15,331 | 73 |
| Idle Wizard (2019) | 117,596 | 298 |
| Idlenetics (2023) | 366 | 2 |
| Idol Death Game TV (2016) | 9,490,171 | 215 |
| Idol Hakkenden (1989) | 460,146 | 156 |
| Idol Hands 2 (2023) | 115,469 | 16 |
| Idol Hell (2023) | 1,198 | 9 |
| Idol Janshi Suchie-Pai III Remix (2007) | 8,449 | 12 |
| Idol Manager (2020) | 16,009,345 | 3,078 |
| Idola Phantasy Star Saga (2018) | 2,265,116 | 2,202 |
| Idolish7 (2015) | 4,729,421 | 987 |
| The Idolmaster 2 (2011) | 9,762,150 | 1,577 |
| The Idolmaster Cinderella Girls (2011) | 33,571,664 | 2,375 |
| The Idolmaster Cinderella Girls: Viewing Revolution (2016) | 552,583 | 47 |
| The Idolmaster Dearly Stars (2009) | 91,630 | 206 |
| The Idolmaster Live For You! (2008) | 464,010 | 109 |
| The Idolmaster One For All (2014) | 3,152,706 | 1,230 |
| The Idolmaster Platinum Stars (2016) | 7,742,602 | 4,588 |
| The Idolmaster Shiny Festa (2012) | 1,415,387 | 228 |
| The Idolmaster SP (2009) | 553,096 | 633 |
| The Idolmaster: Cinderella Girls Starlight Stage (2015) | 66,950,776 | 22,229 |
| The Idolmaster: Million Live! (2013) | 6,541,160 | 1,128 |
| The Idolmaster: Million Live! Theater Days (2017) | 45,693,710 | 50,784 |
| The Idolmaster: Must Songs (2015) | 558,159 | 325 |
| The Idolmaster: Shiny Colors (2018) | 52,362,256 | 11,710 |
| The Idolmaster: SideM (2014) | 37,451,048 | 735 |
| The Idolmaster: SideM Live on St@ge! (2017) | 1,409,360 | 87 |
| The Idolmaster: Stella Stage (2017) | 4,549,383 | 3,731 |
| idolYAKI: From Delinquents to Pop Stars (2021) | 0 | 0 |
| iDracula: Undead Awakening (2009) | 334,439 | 55 |
| iDrop Dead (2009) | 2,065 | 1 |
| IDUN - Frontline Survival (2025) | 167,579 | 79 |
| Idylls of the Lunar Maria (2024) | 18 | 1 |
| If Found... (2020) | 1,444,946 | 356 |
| If Fusion Were That Easy (2022) | 1,003 | 19 |
| If It Moves, Shoot It! (1988) | 56,255 | 21 |
| If It Please the Court (2021) | 0 | 0 |
| If My Heart Had Wings -Flight Diary- (2019) | 37,588 | 126 |
| If On A Winter's Night, Four Travelers (2021) | 710,650 | 523 |
| If The Dream Of Star (2024) | 0 | 0 |
| IF/A-18E Carrier Strike Fighter (1998) | 386 | 1 |
| IFSolitaire (2024) | 0 | 0 |
| IfSunSets (2024) | 1,835,123 | 1,212 |
| Iggle Pop! (2004) | 523,611 | 691 |
| Iggy's Reckin' Balls (1998) | 913,254 | 896 |
| IgKnight Food Fight (2020) | 47 | 1 |
| IgKnight Golf Defender (2019) | 1,066 | 5 |
| Ignatius (2020) | 1,186,499 | 186 |
| Igneous (2009) | 103,988 | 49 |
| Ignis (2024) | 1,108,924 | 298 |
| Ignis Universia: Eternal Sisters Saga (2019) | 2,569 | 30 |
| IGNISTONE (2023) | 37,042 | 140 |
| Ignite (2011) | 7,533,965 | 1,009 |
| Ignited Entry (2024) | 1,300,798 | 359 |
| Ignited in Cavern (2024) | 24 | 1 |
| Ignited Steel: Mech Tactics (2022) | 195,545 | 63 |
| Ignition (1997) | 387,543 | 196 |
