Memory Challenge

Players rummaging through the card, remember the location of different objects to be paired. All cards are opened after the completion. We need to quickly remember what this lattice pattern, and then continue to turn the other grid, while the front of the grid turned into a background image recovery, when the same pattern when we turn to return to the grid, the two identical pictures reveal, then we can find two images are offset from each other and disappeared. This cycle, test your memory, and strive to use the shortest possible time, the minimum number of flop open all the cards, we would easily cross the border.