Your job as Ferry operator is to safely guide 65 people across the water, the people move on their own free will and you need to move your ferry along with them so they don't fall into the water and die. If 3 people are die in the water it's Game Over. Oh and as Time moves along the People want to hurry along, the game is broken up into 5 stages with the following number of people expected to get across to proceed to the next stage:
Stage 1 : 2
Stage 2 : 3
Stage 3 : 10
Stage 4 : 20
Stage 5 : 30