A game that trains logical thinking. The game can be played as a betting game on the truth of implications or just to be the first to find if an implication is correct or not. Example: A statement and an implication is selected: When Betty is reading a book she does not want to be disturbed. Betty does not read a book. Therefore she can be disturbed. With the game material (logical matrix) you can prove that this implication is not correct: ((p --> -q) and -p) --> q If the implication is revised in the following way, the implication is true ((p --> -q) and q) --> -p: When Betty is reading a book she does not want to be disturbed. Betty can be disturbed. Therefore she is not reading a book. This is a game for true mathematical nerds! From the box: ALSO makes you fit in controlled thinking precise in phrasing invulnerable in discussing excellent in solving brainteasers ALSO-players know the rules of precise thinking.