Brain Game Prints is a training and free software toolkit that enables complete beginners to create and sell brain game books on platforms like Amazon KDP, generating passive royalties. Brain game books, such as Mathdoku or Calcudoku books, are digital products sold on sites like Amazon, Etsy, and Folksy. The brain game and logic puzzle market is huge and popular among buyers. This is a proven method to make a passive income online, and with minimal effort, your subscribers can potentially do...