Carol Shaw joined Activision, another prominent video game company, following her departure from Atari. This move allowed her to further explore her game design talents.

Carol Shaw created 'River Raid,' a vertically scrolling shooter game for the Atari 2600. 'River Raid' is widely considered her most successful and influential game. It's known for its innovative gameplay and challenging level design. The game was critically acclaimed and became a commercial success.

Carol Shaw was involved in programming 'River Raid' for the Atari 5200. It was a slightly enhanced version of the Atari 2600 game.

After the success of River Raid, Carol Shaw left Activision to pursue other interests and opportunities.