Board Thread:Geometry Dash Update Discussion/@comment-26490689-20160221170017/@comment-28749161-20160305165843

Demon Coins are just User Coins that are in Demon Levels.

Let's say you got 9 User Coins, 6 from easy levels and 3 from a Demon Level.

In 2.1 instead of having 9 User Coins, you would have 6 User Coins and 3 Demon Coins.