Defeating The Dragon
After you exit the Computer Room, you will face a Dragon. To defeat him, shoot him in the mouth approximately twenty times. You will know that you are hitting him, because he will flash yellow.
Note: After the dragon is destroyed, re-enter the computer room, and re-input the suicide command. This will allow you extra seconds to escape. In addition, it may be usefull to make a map of the exact way out, so you won't waste time getting lost!