: Refers to version 2 of the game (or the specific file dump).
Getting stuck at 90% on a long song can be infuriating. If you are playing a custom workshop level: Press Escape while in the level. Click the button to load the level in the editor. : Refers to version 2 of the game
Literally rolling your hand across multiple adjacent keys (like hitting J-K-L-; in rapid succession). This allows you to multiply your speed without actually moving your fingers faster. : Refers to version 2 of the game