In case you didn't know, you can beat Pitfall on the 2600!!! There are 32 treasures in the game and if you get them all before your time or lives run out, you will get to a kill screen! In order to do so, you have to take a specific path and use the tunnels that are used as short cuts. The game has 255 total screens, but the 20 minute limit makes it impossible to see all of them in a single game.
Anyways, after several attempts I finally beat the game for the first time in my life! It wasn't a perfect run (I lost 2 lives and some points), but I did get to the kill screen!
You can check it out in this video:http://youtu.be/CkDllyETiBA
BTW, Here are the steps to the path you have to take:
Step 1) Start by going right 11 screens. Enter the underground passage on the screen with the single rolling log after the second set of crocodiles. Go to left and take the exit.
Step 2) Once you exit, continue left 10 screens until you find the screen with the 3 stationary logs and take the underground passage and continue left until the exit.
Step 3) After exiting, go right 2 screens and get the ring.
Step 4) Go left 4 screens to the screen with the 2 rolling logs. Take the underground passage and continue left until the exit.
Step 5) Once you exit, go left 24 screens until you get to the screen with 3 rolling logs and an underground passage. Take it and go left to the exit.
Step 6) Once you exit, go left a whooping 63 screens until you to the screen with 3 rolling logs and 3 holes in the grounds including an unground passage. Take it and go left to the exit.
Step 7) Upon exiting, go right 3 screens and get the money.
Step 8 ) Go left another 58 screens until you arrive at the screen with 2 rolling logs and an underground passage. Take it and go left towards the exit.
Step 9) Go right 3 screens to get the gold bar.