An Extreme Demon level in the video game Geometry Dash created by a user known as Cyclic and later verified by LSunix, or simply Sunix. The level features a mainly blue theme and a
fast playstyle accompanied by flashing lights on sections that have the
wave mode, inspired by the level Nine Circles.
The level was initially created in a lighter blue theme with the same manner of flashing lights and
fast playstyle meant to rival Poltergeist, another Nine Circles level that was considered the hardest of the
type of levels at the time. Shortly after the verification of Bloodbath by Riot, Sonic
Wave was buffed significantly, taking on a much darker blue theme, with more detail on certain parts and the addition of several obstacles such as spikes and pillars and narrowing of hallways in the
wave sections of the level. Before admitting to the speedhacking of Sonic Wave by Cyclic, he claimed to have "verified" the level. The level was considered to be too difficult to complete and Cyclic was accused of hacking Sonic Wave, to which he would later admit doing.
Both Riot and Sunix would be the two main contenders for the first
person to verify Sonic Wave legitimately. Sunix would later assume this title, having taken
18 months to complete the level, making Sonic Wave among the longest levels taken to verify in Geometry Dash
history.
