Eggman/Robotnik from Sonic the Hedgehog. Grunge also incorporates influences from indie rock bands such as Sonic Youth. Wide ranges of influences, both sonic and compositional, are combined in electronica recordings. The games are played through a Genesis emulator developed by Sonic Team themselves. Acoustical analysis can be done on a sonic or ultrasonic level. The team felt proud of their recreation of classic "Sonic" gameplay. Nakamura returned to compose "Sonic 2" soundtrack. Critics have given mixed opinions toward Wisps and their integration into "Sonic" gameplay. His trademark hover skates propel him at extreme speeds that rival those of Sonic. However, Shadow shares a lot of similarities with Sonic. Influences on the record included Gang of Four, Black Sabbath and Sonic Youth. Sonic flees from Robotnik, who uses the power of Sonic's quill to match his speed. Reception to later versions of "Sonic CD" varied. The story is also simpler than those of the "Sonic Adventure" games. Blaze debuted in "Sonic Rush" as a playable character along with Sonic.