The new expansion for In the Footsteps of Darwin (see " 'In the Footsteps of Darwin'") focuses on the correspondences of the illustrious scientist. This expansion includes new tokens for the game, such as Publication tokens, classification tokens, and envelope tokens. It also introduces Emma Darwin and Queen Victoria to the game as new characters.   

The expansion, with the base game, is for two to five people, ages 8 and up, and plays in 20 to 30 minutes.