If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Adjust the power and angle of the catapult in order to launch the stuntman. While he is airborne, keep his body parallel to the ground to reduce wind resistance. Use pink clouds to give him a boost. Lastly, deploy his parachute when the stuntman approaches the ground to ensure a safe landing. (Note: Your score is only calculated when the stuntman lands safely via the parachute.
Press and hold the space bar, then release to set power. Press and hold space bar again, and this time release to set the angle of the catapult. Once in flight, use to left and right arrow keys to rotate the stuntman's body. Press the up arrow when the stuntman comes in contact with a pink cloud for a boost. Press space bar to deploy his parachute.