Ergo Card Game Of Logic

John though Daniel would like this card game called Ergo...he was right!
Amazon says: "Ergo is the logical card game for the geek in all of us. Each player plays a variable (A, B, C, or D) and uses familiar logical operators like 'Not', 'And', 'Or', 'If-Then' to prove they exist, and that their opponents don't!"

Dan loved it!