■ Rules are simple.
Solve the problem within the time limit and aim for a high score.
The high score in the game is registered in the online ranking.
Compete for scores with players around the world.

■This time calculation.
There are many calculation games in this game.
Anyone can play happily, even those who are not good at calculations and those who are good at calculation.

■ Let's train parallel processing ability with "DUAL TASK".
Not just a brain training game!
Handle "DUAL TASK" while solving the problem.
If "Dual Task" is successful, the remaining time limit will increase.
The remaining time limit will be added to the score as “TIME BONUS”.

Solve the problem and complete “DUAL TASK” to become the best player in the world.

More details on the official game page of Dual Brain Vol.1: Calculation ...