There are two introduction sequences available, depending whether you hit the 'RED' or 'GREEN' button.
Sometimes you need to warp back to a junction because you took the wrong branch or because of an endless loop you are flying in. Just move to the map and place the outlined rectangle to the red mark you want to warp to (place it with the 'YELLOW' or 'BLUE' button). To actually warp press the 'GREEN' button while you are on the map.
Press 'PAUSE' after the game started (when your about to enter the Pod Bay). Then enter one of the following combinations:
GREEN, BLUE, YELLOW, RED, YELLOW, DOWN, GREEN, RIGHT, RED, UP
or
RED, GREEN, BLUE, YELLOW, DOWN, DOWN, BLUE, DOWN, RIGHT, BLUE
or
YELLOW, RED, GREEN, BLUE, UP, LEFT
or
BLUE, YELLOW, RED, GREEN, BLUE, LEFT
The Title screen will turn black and white and the cheat will be activated. With this cheat, you're invulnerable; you can also warp around the map and have all the guns on the next level you play. To warp around the map, simply bring the map up. There's a solid white block displaying your location and another outlineed block, press either the Blue or the Yellow button; to warp to that point, press the Green button. The only drawback to this cheat is that all the amazing cut sequences are in black and white. There are various other codes which do the same thing at different parts of the game. You can find these by pausing the game and pressing all the buttons until you find one that makes a different sound to the others. Press it then you have to find the next one that makes the same noise. Keep doing this until it makes that noise and the cut sequences are in black and white.
Also, at the start of level one, turn right and at the next crossroads push up. Pause the game, press Yellow, Red, Green, Blue, Up and Left. Unpause and you'll be completely invincible.
It seems that Psygnosis has put some music on the CD not used in MICROCOSM. Just try track 2 from the game CD on your audio CD player.
When you are walking into the pod base, try pressing the LEFT button and keep it pressed until you arrive at the crossway. Now all the level maps are upside-down.