Production shifted to the newly announced GameCube, with the concept and story carried over but all of the data recreated. The platform change was confirmed in September 2000. The game's final version was developed primarily by Capcom Production Studio 3 with additional support provided by Tose. As a result of the transition to the GameCube, it was delayed so that the environments could be upgraded visually. More CGI videos were created as a result of the increased memory capacities, and the voice acting was re-recorded. The iconic sounds of the leeches were actually from recordings of cooking hamburgers. For the gun models, the modelling team was provided realistic-looking airsoft guns to base their designs from. Their designs were so close to the source material that the models, at first, featured replica markings and gas refill inlets. No one on the team noticed until half-way through development. Scenario writer Noboru Sugimura was called back to make some changes to the story. In the prototype's story, either Rebecca or Billy could die with the other character surviving and completing the game. This idea was scrapped as Rebecca dying would ruin the canon of the "Resident Evil" timeline. Billy was also originally designed in the prototype as a more ambiguous character, possibly becoming friend or foe as the story progressed. This idea was scrapped. The character designs were also adjusted: Rebecca for example lost her beret and shoulder pads while Billy received a new hairstyle. The GameCube's use of optical discs reintroduced load times, so the programmers had to use sophisticated programming to make the "partner zapping" system work. Capcom announced its intention to release a game demo in Japan around August 2002.