If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This extremely fun game is the right thing for those who like challenging the brain skills. A very important mater about the brain is memorizing things. So, in this game you have to memorize the right place of a sing in order to match it with its pair. You should try to be fast because if time expires the game ends. Solve the level within given time and move to the next one or otherwise you will play the game from the same level again. Have fun!