Minecraft wiki entry for Beginner%27s_guide, associated text: Moving the mouse (or trackball, for simplicity we refer to the mouse) forward and back causes your character to look upward and downward. Moving the mouse left and right causes your character to turn in that direction, changing which direction is "forward". The keys AWSD moves your character left, forward, backward and right, respectively; note that none of these make your character turn around or even look in the direction you're moving. Be careful about moving to the sides or backward without knowing what's there, as you can fall off cliffs or otherwise run into danger! Looking around also lets you pick out individual blocks or creatures to interact with, see below. If you walk off the edge of a block to where there is no solid block, you fall. If you fall more than three blocks (and not into water) you take damage depending on the distance fallen. If you fall into water over your head, you can eventually drown unless you swim back to the surface, and if you fall into lava, you quickly burn to death!