Free of charge at limited time.

-Rule of Game
To become ten, it calculates by using the figure of one digit from 1 to 9 once respectively.
The calculation can use only arithmetic operation (+,-,×,÷).
The minus sign cannot be put ahead of the figure.
It is not possible to calculate by the figure's tying as a figure of two digits.
The calculation where the decimal point is generated cannot be done.
The figure cannot be made more than the three digit.
Passing is possible up to five times. Game over when the sixth passing.
Waiting time is added as a penalty at the mistake.
The ranking is time when the number of problems of set screens was cleared.
The best time can be transmitted to "World Ranking" in each number of problems via the Internet.
It is necessary to register "World Ranking Name" to prior more than set for registration to "World Ranking".