Info from Wikipedia and Mobygames: The Prophecy (also known as Ween: The Prophecy) is a point and click adventure game developed by Coktel Vision and MDO, and published by Sierra On-Line in 1993 for DOS, Amiga, and Atari ST.
This point and click adventure takes a fantasy setting, in which you play a Wizard deemed to be ‘good’ taking on a less good one. To fulfill the prophecy you have been given in a limited time of 3 days, he must go on 3 quests, solving various puzzles along the way to be rewarded 3 grains of sand, that he must place in a hourglass to kill an evil wizard. Objects around the levels are always detected by the cursor, making each screen and the challenges within quick to comprehend. Generally you have to solve each puzzle in sequence.