An instant classic, 21 Marbles is a revolutionary game that starts out easy, but at the higher levels challenges
even adults. It's a friendly and relaxing game - the best way to get kids to practice arithmetic with small numbers and
at the same time learn about reasoning, logic and perseverance.
21 Marbles is inspired by the Montessori and Waldorf methodologies, and the Russian Math School. It involves reasoning similar to Sudoku, but with movement and colours that make it engaging even for infants.
Ideal both for homeschooling math, and for brain training agains Alzheimer's.