Even before officially joining Nintendo, his first product is the audio for Nintendo's arcade game "Punch-Out!!" (1984). By creating mostly jingles and sound effects, he was able to overcome the challenges of early arcade sound hardware. As the Famicom had become highly popular in Japan since its 1983 launch, Kondo was assigned to compose music for the console's subsequent games at Nintendo's new development team, Nintendo Entertainment Analysis and Development (EAD). His second Nintendo product is the instruction manual on how to program Japanese popular music into the Famicom using the peripheral "Family BASIC". To conclude his first year at Nintendo, he created some of the music of "Devil World", alongside Akito Nakatsuka. In 1985, Nintendo started marketing the Famicom abroad as the Nintendo Entertainment System (NES) to capitalize on the 1983 video game crash that had devastated Atari, Inc. and other companies. He composed the music for the hit releases "Super Mario Bros." (1985) and "The Legend of Zelda" (1986), of which 60 million copies were sold in total and which established some of the most well-known melodies in the video game industry.