From that experience, spring break of his first year in high school found Nakamura porting the arcade game "Space Panic" as "ALIEN Part II", published in the May 1981 issue. The program was released on cassette tape and brought in royalty income of ¥200,000. Then in the January 1982 issue, "Scramble" (later renamed to "Attacker" due to legal issues) was also released on cassette, earning royalties of ¥1 million. Furthermore, the port of "River Patrol" called "River Rescue" was published in the "Maikon Game Book 4" special edition of "I/O", bringing Nakamura's total high school earnings from submissions to "I/O" to over ¥2 million. Due to his activities with "I/O", he became preeminent among young PC enthusiasts.