I remember playing this as a child, but the instructions told you nothing and it seemed way too hard. It STILL is too hard, and the wonky controls are made worse on a keyboard. Anyway: you must crawl around the web, collect all four green dots, and then return to the bottom-left corner to finish the level. Avoid the spiders, and beware the mandibles of the "Gorn" which scoots across occasionally. Press the joystick button to destroy the web strand you're on, but only when you're near the end; this kills any spiders that are on the same strand. Neat idea but too hard.