MTO
From Sega Retro
MTO (エム・ティー・オー) (abreveation from "Motorsports Software Technical Office")
The company refused to publish games with a CERO rating until 2006.
Softography
Games marked with # lacks a CERO rating.
Game Boy Advance
- Ocha-ken no Heya (2003) #
- Ocha-ken Kururin ~ Honwaka Puzzle de Ho~ttoshiyou? (2004) #
- Ocha-ken no Yume Bouken (2005) #
- Ocha-ken no Bouken Jima: Honwaka Yume no Island (2005) #
Nintendo DS
- Ocha-ken no Heya DS (2006) #
- Ocha-ken no Heya DS 2 (2007)
- Ocha-ken no Daibouken: Hon Waka Yumemiru Sekai Ryokou (2007)
- Ocha-ken no Heya DS 3 (2008)
- Ocha-ken no Daibouken 2: Yume Ippai no Omocha Hako (2008)
- Jewelpet Kawaii Mahou no Fantasy (2009)
- Ocha-ken no Heya DS 4: Ocha-ken Land de Hotto Shiyo? (2009)
- Jewelpet Mahou no DS Kirapi Kariin (2009)
- Jewelpet Mahou no Oheyya de Issho ni Asobou! (2010)
- Jewelpet DS 4 (unreleased)