Turn two cards in this 3 by 4 cards grid. Memorize them. Turn them back. Repeat with other cards.
Match a red card to a black card with the same face value.
Ensure to turn a card again only if you found its pair.
Once done, you'll see your score. The maximum score is 100%. There will be points deducted
- for luck (turning pairs at once 'by accident')
- for taking long
- for turning cards more often than needed