Claim: 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.
Evidence: Sigma Harmonics (シグマ・ハーモニクス, Shiguma Hāmonikusu) 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.