Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Boggle 3-Minute Word Game 1987 Edition
Product description: Within 3 minutes try to find as many words of 3 letters or more hidden in the letter grid. Object is to list as many words of the highest point assortment of letters in the grid.
Product feature: 16 letter cubes, Letter grid with dome, 3-minute timer
Product brand: Parker Brothers
Target attributes: Maximum Players
Answer: attribute: maximum players
value: None
source: None