The goal of the game is to place on the timeline in the correct order as many cards as possible as quickly as possible. Warning: The time limit countdown is shown in the upper right corner. In the Inventors and Women Scientists games, the cards are ordered by the date of birth; in the Inventions game, the cards are ordered by the year of the invention. Use the mouse to drag the cards on the timeline. When the card is placed incorrectly, the timeline becomes red and the incorrectly placed card returns to the deck.