Use your arrow keys to dodge Mz. Ruby's voodoo blasts in time with her dance.
Mash the space bar when you have an opening to gain points rapidly.
If your groove is solid enough, you'll stop Mz. Ruby from resurrecting Clockwerk.
If your timing is sloppy, Clockwerk will come back.
High score unlockables, secret mode, and a reward for beating secret mode.
(If you have sync issues, try refreshing the page a couple times.)