The role-playing, single-player video game, Sigma Harmonics, was developed and published by Square Enix for the Nintendo DS platform, and it debuted on the Japanese sales charts at number 8.
Sigma Harmonics (, Shiguma Hamonikusu) is a role-playing video game developed and produced by Square Enix for the Nintendo DS handheld game console. Single-player Sigma Harmonics debuted on the Japanese sales charts at number 8, selling 23,000 units. 
