Donkey Kong Jr. is another good game for the Atari 2600!  This game was the sequel to the original Donkey Kong.  In this version, you play Donkey Kong Jr. and your goal is to rescue your dad (Donkey Kong) from Mario.  You climb up vines and try to get to the top and grab the key to the cage from Mario. Although the Atari 2600 version doesn't have the best graphics, it's still a fun game to play!  This one is more difficult to find that the original Donkey Kong, but it still won't cost a fortune.