Very strange. This 'Spot The Difference' is since a hint comes out from the start.It is easy to memorize and easy to challenge. Very cute charactors enters game. 1. It is a high score by a quick correct answer. 2. The more it carries out "Chain",the more the rate of a bonus when it answers correctly rises. 3. If it continues playing one collection of problems, a collection of problems will grow and carry out a class change. There are three kinds of classes, Bronze, Silver, and Gold, and there is a privilege in them. 4. If LEVEL goes up, the bonus at the time of the end of a game will go up steadily. Use well the four elements, try for higher scores than friends.