xStep

Most levels give a color in Practice mode, and an icon in Normal mode. Clubstep, however, gives a secondary black color as a reward for Normal mode and a UFO for completing it in Practice mode.

However, the Steam version introduced another icon for completing Clubstep. (The achievement name is SteamStep! Also, In update 1.9.2, the Steam icons were brought to the mobile version, enabling this icon for all players.)

However, on mobile it's a secret: The icon is hidden. First, you need to complete Clubstep in normal mode on Steam version, and sync it with your mobile account. You will not get this icon by completing this on mobile.

The name "Clubstep" is a pun on dubstep, which is the type of music playing during the level, along with electronic.

If you jump right before the first ship portal instead of hitting the gravity pad, you can fly upside down in the first part of the flying section.