One of the most impactful levels in the history of Geometry Dash, Sonic Wave by Sunix is a 1.9/2.0 Nine Circles level that was hack verified but later reverified legitimately by Sunix. However, despite the everlasting effect on Geometry Dash as a whole, it kind of falls flat in some aspects.

Being a Nine Circles level, it's not exactly that unique, however it has a somewhat unique gameplay structure that isn't cube -> ship -> ball -> wave -> last cube, but instead is an XL that uses most of the song. The decoration is what you would expect from a Nine Circles level, but it is still slightly empty regardless.

Besides the decoration, the gameplay is not exactly enjoyable, having some major chokepoints throughout the level. However, it still is somehow enjoyable? No idea how, but if you enjoy wave, you will probably enjoy Sonic Wave.

Overall, an okay level, and is far from being abhorrent! If you want a good wave based level, playing this isn't a bad option.