Grade: A (95.72)
It doesn't get much more classic than this. Everyone has a copy of Space Invaders stuck in their closet somewhere. It's hard to believe this wasn't the first game designed for the 2600. The game - shoot the aliens before they shoot or squish you. You can play against someone or work together. This cartridge has more options than the Chicago Board of Trade. You'll get calluses just flipping the game select switch.
Images from www.atariage.com (used by permission)
Descriptions from www.atariguide.com (used by permission)