Founded in 1994 by former employees of Data East, they are known for publishing various mixed quality titles, especially in the IF Neverland series, Otome visual novels, and even games developed by Compile Heart.
Games published by Idea Factory
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- Ao no Mama de
- Cardinal Arc: Konton no Fuusatsu (PlayStation 2)
- Chaos Wars
- Cyberdimension Neptunia: 4 Goddesses Online
- Death end re;Quest
- Death end re;Quest 2
- Fairy Fencer F
- Fairy Fencer F: Advent Dark Force
- Gakuen Hetalia DS
- Gakuen Hetalia Portable
- Gakuen Toshi Varanoir
- Generation of Chaos
- Generation of Chaos Next
- Getsumento Heiki Mina: Futatsu no Project M
- Hyperdevotion Noire: Goddess Black Heart
- Hyperdimension Neptunia
- Hyperdimension Neptunia Re;Birth1
- Hyperdimension Neptunia Re;Birth2: Sisters Generation
- Hyperdimension Neptunia Victory
- Hyperdimension Neptunia mk2
- Lost Aya Sophia
- Megadimension Neptunia VII
- Motto NUGA-CEL!
- NUGA-CEL!
- Neptunia & Friends
- Neptunia Game Maker R:Evolution
- Neptunia Riders VS Dogoos
- Neptunia Shooter
- Neptunia Virtual Stars
- Neptunia x Senran Kagura: Ninja Wars
- Neptunia: Sisters VS Sisters
- REC - Doki Doki Seiyuu Paradise
- Realm of the Dead
- Spectral Force
- Spectral Force 2
- Spectral Force Genesis
- Spectral Tower II
- Spectral vs Generation (PlayStation 2)
- Steady x Study
- Super Neptunia RPG
- Superdimension Neptune VS Sega Hard Girls