It is necessary to go to seek a "treasure". For that, it is simple, it is enough to find the good way while clicking on the red arrows. Of course all the ways are not the goods and there is no index. But one can start again the play (except if one is killed out of suite)en not clicking on "restart" but on "last chekpoint" thus, one remains at the point where one was done killed! Very easy and fast! (Translated by google)