Bringing the high-speed world of Sonic the Hedgehog into three dimensions proved to be a monumental challenge, according to veteran members of Sega's Sonic Team. In a discussion with Continue magazine, Takashi Iizuka, Kazuyuki Hoshino, and Jun Senoue detailed the development struggles of the original Sonic Adventure, a game they now consider the most difficult in the series' history.
Iizuka, who currently heads Sonic Team, recalled his direct involvement in Sonic Adventure's development, stating, "Because I wrote the specifications and worked on the development staff for the game, I would have to say Sonic Adventure left the biggest impression on me. However, that first game, rather than being fun, I remember it being a very difficult development."
Senoue, the composer and sound director for the franchise, elaborated on the sheer volume of work required. "We started work on that game in 1997, and I’d never experienced anything like the volume of work that game took before then," he explained. "We developed stories for six characters, plus the Chao and Chao Garden, and worked on the field music. Then we had voice acting. That was something I wasn’t familiar with at the time, so having to manage everything was quite challenging."
The team struggled with translating Sonic's signature speed into a 3D environment. "We first tried bringing Green Hill Zone into 3D, but just running around that wasn’t fun," Iizuka said. "We just didn’t know how to make it more interesting, so we ended up doing a lot of trial and error all the way through development. There weren’t any similar 3D games where you ran like this, so we didn’t know the answers either."
In contrast, the development of Sonic Adventure 2 was a more positive experience. This sequel was developed in the U.S., mirroring the approach taken for Sonic the Hedgehog 2 and 3, which reportedly streamlined certain aspects of its creation.
Despite the initial difficulties, Sonic Adventure was not the last 3D Sonic title to present significant development hurdles. Iizuka identified Sonic Frontiers as another major challenge, drawing parallels to the issues faced with Sonic Adventure. "The idea of running through a vast expanse was decided very quickly, but the challenge came in working out how you would have someone play in such an open space," he noted. Unlike previous Sonic games which featured more linear paths, Sonic Frontiers required the team to invent ways to make a large, open world engaging. "We started that project without any answers on how to make this space exciting, which was in some ways similar to Sonic Adventure. We were looking for answers while we were making the game. It took till about the halfway point of development to find that answer, making it also an overall challenging project."
Though both Sonic Adventure and Sonic Frontiers presented unique development difficulties, they stand out as particularly successful and fondly remembered entries in the series. Senoue also mentioned that composing the music for Sonic Generations was a demanding task, yet that game also achieved critical and commercial acclaim.