Missionaries and Cannibals

The missionaries have been caught by a man-eating tribe when they are preaching in the distant lands. The chieftain of the tribe requires the missionaries to solve an ancient riddle or they will be cooked. Your goal in this game is to find out the answer of the riddle by transferring the clergymen and the cannibals to the opposite bank of the river. You will be given a raft floating on the river, while 3 clergymen and 3 cannibals are on a shore. Click to transfer 1 to 2 persons on board as the raft cannot move without passengers. Then click the raft so that the passengers can travel to the opposite bank. When the raft arrives, you may click to settle the passengers. Note that when the number of missionaries is smaller than that of the cannibals on a side, the clergymen will be eaten and the game will end. The time you have spent is recorded at the top left corner. Save the missionaries so that they can return home!