Brainbox is a fun memory and observation card game, sold in 8 million copies worldwide. The game tests your attention to detail. All the answers are on the card, but you only have 10 seconds to study it. Mathematical Edition: - Learn fractions, multiplications, time, and much more while testing your memory and observation skills. - 440 individual questions will allow you to enjoy the game again and again. - One or more players can enjoy a turn-based game in about 10 minutes.