Unconfirmed Features

Woomy-Arras.io is known to have numerous unconfirmed features that do not appear in the changelogs and are sometimes even unseen in-game. Sometimes, these features are seen in-game, but have no reference in the changelogs.

Sunburnt Shapes
Shape such as the Sunburnt Square, Triangle, and Pentagon are known to exist; however, there has never been a reference in the changelogs and the developers are secretive about them.

Icosagon
The Icosagon is a feature that was supposedly removed in late 2019, but it has been rumored to still spawn occasionally. Despite this, there is no hard evidence to support either its removal or its existence at all.

Splitters - Confirmed to not to exist
There were three unconfirmed splitter shapes, all of which were rumored to exist but never seen in-game. As none of them were in the game's code, they are confirmed to not to exist.
 * Splitter Triangle: What these produce is uncertain
 * Alpha Splitter Pentagon: Possibly very large/strong triangular crashers
 * Splitterdrive: Likely a Splitter that produces Sentries.

Hexagon and upwards
While Alpha Hexagons, Alpha Heptagons, and the like are known to exist, the regular versions of them have never been seen. For a time, Hexagon existed, but it has never been seen since around early 2019.

EK-3 and upwards
These tanks are present in the code but have only bee seen in developer events where bosses are unlocked or in very early period of the game. The EK-3 is rumored to periodically upgrade from EK-2, but the wait time is often an hour or longer and the boss is usually dead by then.

TK-X
The TK-X series of bosses, based off the Triangle, are present in the changelogs as "spawnable bosses" but have never been seen in the game. This goes for MK-X (square-based bosses) and PK-X (pentagon-based bosses)

Elite Bosses
Elite variations of all bosses may exist, but only a few have been confirmed to exist.