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|Creator||KrmaL, AncientAnubis, AirSwipe, verified and published by KrmaL|
Heartbeat is a 2.0 Extreme Demon collaboration created by KrmaL (who also verified and published it), AncientAnubis, and AirSwipe. It is known for its odd gameplay relative to other levels by the creators, mashing, tight spaces, memorization, and timings. It also contains three verified user coins. The level is currently #77 on the Official Geometry Dash Demonlist.
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 KrmaL's (as Krazyman50) name and the two decorators, Anubis and AirSwipe.
- This level was verified just before KrmaL took a break.
- This level has a fake secret way that allows the player up to 99% before abruptly killing them.