Spectre Cheats (Macintosh)

To get infinite lives hold down COMMAND, CONTROL and THE KEY
  WITH A TRIANGLE FACING TO THE LEFT.
  Or press THE KEY WITH A TRIANGLE FACING TO THE LEFT and then
  press ENTER.

  Or find a little switch on the back of the computer and flip
  it.

  Or pull out all of the cords from the back of the computer.

Hold Option key down when selecting "Play" to choose a starting level.

For spectre VR, i found a code. You get the spinning weapon,
  and shoot it at the portals(the ones that warp you from one
  part of the level to another). when it is spinning, go
  through it. This will warp you to a couple levels away.
  Yiou can do this as many times as you like.

When playing the game, type GOD to get a bird's-eye view of the entire
  battlefield at once.

When your playing the game type in the letter G O D
  for the god view.

Hold down the option key while pressing play to choose your sub matrix to start on

Type in Go to enter God mode. This allows you to have a full
  map of the level. Type Go in again to exit this mode.