Addictive learning game pits man versus machine. Who's smarter? Search bots find answers. Guess the question. Did the robots show smart clues? Beat the 5 minute timer. Game provides the following: - Slow spelling of the answer, letter every 5 seconds. - Image results from Google, Bing, and Yahoo. - Clue with meaning or context. - Cheat sheet with the complete list of answers. This chemistry sampler is free. The full collection is a three-book series of games for kids, teens, and adults. Join the 300,000 plus who have downloaded Keys apps.