Geometry Dash Nock Em is an Epic Medium Demon level inspired by Sub-Zero with impressive and simple gameplay. Decorative details as well as obstacles are designed with moderate density and have a balanced layout. The neon color combination creates a special feature that rarely appears in other levels. Usually, other daily levels will coordinate colors in the same tone in decorative details. However, in Nock Em, the author has created many breakthroughs in color and gameplay, typically combining neon purple and neon green together on a dark background to create a magical feeling. Combined with monsters that are just waiting for the player to fall, it creates a terrifying darkness. In addition, the details are also very diverse so players will not feel bored, instead, they will be surprised because they feel like they are discovering a new world. This world includes skyscrapers and the red-orange color of volcanic lava combined to create wonderful changes.
Levels that are not too difficult will help players enjoy outstanding animations and the impressiveness of sequential effects. The character's appearance can also change continuously thanks to passing through glowing circular gates. This change allows players to adapt to the terrain and layout of the next stage. Unlike other levels, at the end of this level a final boss appears to attack you. The image of a gray skull using a laser gun and missiles is a bold highlight for a complete ending.