Here's a great game to build and test your powers of memory. The instructions are in Japanese, but I will explain here. The door opens and you are presented with some pictures. Remember them! After a few moments the door closes and then reopens. This time, there is one image that is different from before. Click on that image. If your answer is correct, you proceed to the next and more difficult stage. If you fail, game over. Refresh the screen to play again. The only Japanese you need to know is [ゲームスタート] for Start the Game. When you finish you will also see your ranking on a scale from 1 to 10. Good Luck!