Ultimate Destruction

Ultimate Destruction is an unreleased level from the Geometry Dash beta. Presumably, it evolved into what is now known as Base After Base.

Level description
What is shown of the level mostly resembles Base After Base, although the start shares the same spike arrangement as Stereo Madness, indicating the level had begun development before it was split up to become those two individual levels. Jump pads and rings appear in the level, along with gravity portals of both the entry (yellow) and exit (blue) variants. This goes to show the extent of development had already progressed beyond the original design elements shown in the image below. The last significant difference is the fact that while flying the ship, the drop-down roof had not yet been implemented to contain the ship to the static view and could be flown outside of visibility. The trailer only shows the first two thirds of the level.

Trivia

 * The cube icon used in the level is unlocked by completing Can't Let Go.
 * Ultimate Destruction probably evolved into the level Base after base.
 * When Robert Topla posted the Ultimate Destruction video on YouTube, Geometry Dash was called Geometry Jump.