Windy Circles is a 2.0 Insane Demon created by Keias. It is a very difficult Nine Circles remake that consists of difficult memory segments and numerous tight spaces. Due to this, it is generally considered a Very Hard Demon, but possibly an Insane Demon.
The non-wave sections change colors periodically, with simple Nine Circles decoration. The wave parts actually utilize a white color scheme, with a flashing background that cycles through the colors. The wave segments also have some unique backgrounds.
The level starts with an invisible jump. The following cube section has many timings and tricks, which require you to find a good strategy. At the end, the player has to lightly tap a blue orb to go into a short mini ship with one space flying and a gravity portal. Then there is a ball segment with a few timings and tricks. Then it goes into a short, moderately tight ship segment with a gravity portal. Then it goes into the drop of the level, where the player has to time a blue jump orb to avoid dying. Then it reaches the Nine Circles triple speed wave segment. The wave is marked by very tight spaces, weirdly placed gravity portals, and memory sections. Then it turns into a dual wave that starts out mini but later goes large. Then there is a wave section much like the first, until there is an auto mini wave section. Then there is another section like the first one, but this section has parts that are either auto or require holding to pass. After a bunch of this, the level ends with a half-speed mini wave segment.
- This level was updated to make it a good deal harder, the older version lacked many of the spikes and had the name "Windfall."