
Grezzo is a Japanese video game studio run by Koichi Ishii, known for his work on the Mana series of games by Square Enix. The company's name comes from the Italian phrase "diamante grezzo", meaning "a diamond in the rough".
Grezzo is a Japanese developer founded in 2006 that currently has 16 titles listed as a developer on PlayPile, with no credits as a publisher. The studio was established by Koichi Ishii, who is known for his work on the Mana series at Square Enix. Their name comes from the Italian phrase "diamante grezzo", meaning "a diamond in the rough". The company has been active from 2010 through 2024. Most of their output occurred during the 2010s with 14 games, while only two titles were released in the 2020s so far. Their work focuses heavily on the Adventure genre with 15 credits, followed by 9 Puzzle games and 4 Role-playing games. One Simulator title also appears in their catalog. Their platform reach is almost entirely centered on Nintendo hardware. They have released nine games for the Nintendo 3DS, six for the Nintendo Switch, two for the upcoming Nintendo Switch 2, one for the Wii, and one for the Nintendo DSi. The quality of their work shows a strong trend toward high scores. Across nine rated titles, they hold an average IGDB rating of 78.5. Five of these games are considered great with scores above 80, and four are rated good between 60 and 79. There are no mixed or poor ratings in their tracked history. Their highest-rated work includes The Legend of Zelda: Ocarina of Time 3D from 2011 at 91.2 and The Legend of Zelda: Majora's Mask 3D from 2015 at 90.8. More recent entries like The Legend of Zelda: Echoes of Wisdom (2024) score 84.9, and The Legend of Zelda: Link's Awakening (2019) reaches 84.6. Other notable releases include Luigi's Mansion from 2018 at 80.5 and Miitopia from May 2021 at 67. The volume of their production dropped significantly after the 2010s, moving from 14 games in that decade to just two in the current one. While their recent output is smaller, the ratings remain consistently high for their known projects. Grezzo has built a reputation primarily through its work on major Nintendo franchises rather than by publishing original IP themselves. Their catalog shows a clear preference for established series and specific console hardware over broad multi-platform releases.















