Flying (moving up and down)
You'll need to use the keyboard to fly up and down. The (plus) key moves you up, and
the (minus) key moves you back down again. Press the plus/minus keys on the numberpad, not
the dash or the =/+ key. You can hold these keys down to keep moving up or down, and you
can use them in combination with CTRL to move faster or the SHIFT key to move through
objects.
Using the plus key turns off gravity until you touch the ground again. While gravity is
off, you can continue to fly up or down until your feet touch the ground again. Press the
minus key until you touch in order to turn gravity off. While you're in Fly mode, you'll
notice that you'll coast more before coming to a stop in either the horizontal or vertical
direction. If you want to come to a sudden stop, you can press the "5" key (the
"Stop key") in the centre of the numberpad.
Keyboard modifiers
Several keys on the keyboard have additional effects when used in conjunction with the
primary movement keys: