Geometry Dash Lite
Geometry Dash Lite is the lite version of Geometry Dash. It currently has seven levels from the full version, lacks level editing and sharing features, and is ad-supported.
Since the content is limited, the total amount of unlockables is also significantly reduced. A maximum of 28 stars and 21 Secret Coins are available. To unlock the coin-related achievement requires just 15 coins, rendering further collection of coins unnecessary if intending to unlock anything. Stars serve no other purpose.