Tap LEFT ad RIGHT arrow key cosequetly to accelerate. 

Ride your horse and beat all your opponents in the Derby Racing. Every next level you are unlocking is getting harder and harder.... Run longer distances with faster horses! Legendary horses will be waiting for you in the final level. You can become a derby champion if you beat the legendary horses.

For iOS:
Safari on iOS 8 and later supports WebGL 1.0, and on iOS 15 and later supports WebGL 2.0.

For Android：
Nearly all of them support WebGL