Research Methods: Hidden data, shared staff
- Matsumoto Tooru no Kabushiki Hisshou Gaku (under subcontract with Digital Presence?) (JP Publisher: Imagineer)
- Ultima: Kyoufu no Exodus / Ultima: Exodus (programming?; under sub-subcontract with Digital Presence?) (JP Publisher: Pony Canyon; US Publisher: FCI)
- Production: Newtopia Planning
Matsumoto Tooru no Kabushiki Hisshou Gaku contains the following string:
MUSIC_KA Version 1.1 in 1987-11-1Copywrite by Softhans ,Tomohiro Hori
According to Infinity head Yukio Horimoto, the contract for FC/NES Ultima IV (developed by Infinity) was given by Newtopia Planning through a company called Digital Presence, which was run by the same person who ran Digital Arts. 
Digital Arts appears to be run by Takaaki Ushiki , who was "program director" on Matsumoto Tooru no Kabushiki Hisshou Gaku and "chief programmer" on Ultima: Exodus.