+++ Game to train your brain in the subtraction +++

* The training the brain to answer quickly in the calculation
* Calculation subtracts all
* The challenge in the world rankings in GameCenter

[ How to play ]
It is a game to answer in the early press the answer of the calculation.

Let's answer to select an answer from the two buttons with numbers.

Score is added if you answer, the following problems will appear on the exam!
The game is over you make a mistake in the problem.

Calculations that are questions here is subtracted all.

[ Tip ]
High score you'll earn if you answer quickly.

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