Yes, this game is completely free to play on Slingdrift.com .

How do you hold a drift?

To hold a drift in Sling Drift, tap and hold the screen (or click the mouse) as your car approaches a turn. Keep holding until the car drifts around the bend, and release at the right time to straighten out and continue driving. The key is in the timing and how long you hold the drift to keep your car on track!