For Cooperative Mode:

• Try to play the card in your hand closest to the date on the card already in the timeline.
• Don't be afraid to discard from your hand if none of your cards fit the timeline - if the symbol on the car matches the one in the discard pile, you can discard.
• Also, don't forget that you can pass or end your turn after playing one card. This may help you if the other player has closer cards than you - remember, you're working together!