Parachute (SYBEX)

Try jumping from a helicopter in flight and hitting the target on the ground. Pressing a button once sends you plummeting vertically. Pressing it a second time opens your parachute. You'll then descend more slowly at a 45-degree angle because of the wind pushing you. The longer you wait to open your parachute, the less you'll be thrown off course. But don't wait too long, because below 100 meters, the parachute won't open

From the type-in book "Jeux en BASIC sur Commodore 64", also published in aBc Informatique #34.