| Iwatobi Penguin Rocky x Hopper 2 - Tantei Monogatari | PlayStation |
JP | 1998-02 | published, developed |
| Hiza no Ue no Partner - Kitty on Your Lap | PlayStation |
JP | 1998-03-12 | published |
| Jikki Pachi-Slot Tettei Kouryaku - Yamasa Collection | PlayStation |
JP | 1998-03-26 | published, developed |
| Jikki Pachi-Slot Tettei Kouryaku - Speed-CR Kinkakuji 3 | PlayStation |
JP | 1998-08-20 | published, developed |
| Simple 1500 Series Vol. 1 - The Mahjong | PlayStation |
JP | 1998-10-22 | published |
| Simple 1500 Series Vol. 2 - The Shougi | PlayStation |
JP | 1998-10 | published |
| Simple 1500 Series Vol. 3 - The Gomoku Narabe | PlayStation |
JP | 1998-10-22 | published |
| Simple 1500 Series Vol. 4 - The Reversi | PlayStation |
JP | 1998-10-22 | published |
| Simple 1500 Series Vol. 5 - The Igo | PlayStation |
JP | 1998-11-19 | published |
| Simple 1500 Series Vol. 6 - The Hanafuda | PlayStation |
JP | 1998-11-19 | published |
| Simple 1500 Series Vol. 7 - The Card | PlayStation |
JP | 1998-11-19 | published |
| Simple 1500 Series Vol. 8 - The Solitaire | PlayStation |
JP | 1998-11-19 | published |
| Simple 1500 Series Vol. 10 - The Billiard | PlayStation |
JP | 1999-04-22 | published |
| Simple 1500 Series Vol. 9 - The Chess | PlayStation |
JP | 1999-04-22 | published |
| Simple 1500 Series Vol. 11 - The Pinball 3D | PlayStation |
JP | 1999-07-22 | published |
| Simple 1500 Series Vol. 13 - The Race | PlayStation |
JP | 1999-07-22 | published |
| Simple 1500 Series Vol. 12 - The Quiz | PlayStation |
JP | 1999-08-12 | published |
| Purumui Purumui | PlayStation |
JP | 1999-09-14 | published |