During the development of Kirby's Dream Land, HAL Laboratory provided Masahiro Sakurai with a Twin Famicom, a console that combined the standard Famicom and Famicom Disk System, to use as a development kit. The hardware did not feature physical keyboard support, meaning that values had to be inputted using a trackball and an on-screen keyboard. At the time, Sakurai was under the impression this was "the way it was done," and he coded an entire functional test product using just the trackball. He claimed the process led to some improvements managing the game's "data processing load," allowing it to have "very smooth movement for a Game Boy game."