To find all the matching pairs of cards.
Pick the symbols and difficulty level you wish to play and click "Start Game" to begin.
Periodic Table(match elements with their symbols) European Flags(match European countries with their flags) Clocks & Time(match clock time with digital time) Fractions and Decimals(match fractions with their decimal values)
Easy (4 pairs) Medium (7 pairs) Hard (10 pairs) Extra Hard (14 pairs)