If you haven't already, go to and purchase Geometry Dash ($3.99 USD). Install it on your PC. Note: The free mobile version does not support the same custom level browser as reliably for high-end demons like RazorLeaf.
Disclaimer: Ensure you download Geometry Dash from official sources like Steam to avoid malware. "Hot" levels refer to their high difficulty and popularity. If you'd like, I can: Help you find in Geometry Dash