Heartbeat

Heartbeat is a 2.0 Extreme Demon collaboration created by Krazyman50 (who also verified and published it), AncientAnubis, and AirSwipe. It is known for its weird gameplay, mashing, some tight spaces, memorization, and timings. It also contains three verified user coins, in addition to being generally considered an Extreme Demon. The level is currently #69 on the Official Geometry Dash Demonlist.

Gameplay
The level starts with a slow speed cube segment with a series of two-spike jumps. Next, there is a mashing mini-cube segment where the player must deliberately miss one of the blue jump orbs to fall up and enter the next part. This is followed by a mini cube segment with a bunch of mashing and tricks to throw off the player. Then there is a memory cube part with rows of moving orbs, followed by a tricky timing-based mini cube. Afterwards, there is a section with many tricky orb configurations with many gravity portals. Then there is a ball part with a lot of memorization and timings. This is followed by a similar dual ball segment. Then there is an easier ball part followed by a cube part with a single jump orb. Then there is a difficult UFO segment that features numerous tight timings as well as tricky gravity portals and orb usage. At the end, there is a part with lots of UFO spam. Then there is a slow speed cube segment, leading into a very long wave spam section with lots of speed and size changes. This is followed by a rather difficult ship section with many orbs and tricks to avoid. Then there is a rather difficult robot part with numerous tricky jumps. Last, there is a rather long cube section with the player flipping around quite a lot as well as lots of memorization. At the end of this, the level ends with Krazyman's name and the two decorators, Anubis and AirSwipe.

Trivia

 * This level was verified just before Krazyman50 took a break.
 * This level has a fake secret way that takes you to 99% and kills you.