It feels great to play this game again after so many years.
A few hints for new players:
The goal of the game is to transport a certain number of passengers from cave to cave without dying. You can die from a hard impact to a wall, or from lack of energy.
Energy is represented by the yellow “food” bar, in order to get more energy you have to pick up the stone (land on it without a passenger in the copter) and then throw it on the tree.
There are three types of passengers: a man, a woman and an old man. The only difference between the three is how long can they stay in water, an old man will drown immediately, a man can stay in the water for a while and the woman can swim for quite a while. If you land in water anywhere they will swim towards you.
Beware of the bird, it announces itself with a shriek.