A compare between GB Puyo Puyo and Super Robot Taisen suggests that Q Billion may also be by them. Wouldn't be the only uncredited title they did for Seta... The music sounds a lot like Formula One: Built to Win, too. --Dimitri (talk) 07:38, 11 May 2017 (CEST)
- Ran a second compare between Q Billion and Oni (the earliest of the listed titles) and that turned up a fair bit more shared code. I'm pretty confident of this one, so I've added it. --Dimitri (talk) 18:48, 11 May 2017 (CEST)
And also: Kabushiki Baibai Trainer Kabutore! (JP Publisher: Konami), this is a DS game and not PlayStation 2. But I'm not sure though...