 While attending Waseda University, Saito played SimCity on the Macintosh, which prompted him to pursue video game creation after graduating. His first game was a simulation title that was part of a future media project for a publishing house. When Saito asked to develop a second, the business refused because it was not a video game company. He left the company to personally produce the second game, which built on ideas he conceived while working on his first: elevators and towers. Saito teamed up with freelance programmer Takumi Abe to complete the project. To research the gameplay, Saito contacted an elevator company to learn about elevator scheduling and management. However, the company declined to provide the information. Saito handled the graphic design, and started with a monochromatic scaled tower created in HyperCard. The designer added color to differentiate between office- and hotel-type buildings. As development neared completion, Saito noticed that the Mac's performance had improved and decided to increase the color palette size from 16 to 256 colors. Saito enlisted a second designer to produce animation for the graphics and improve the details for the color increase.
