ブレイン21 -ブラックジャック風の脳トレパズル

A new blackjack-style brain training puzzle.

Add up to make 21 numbers!
Diagnose your brain age with an easy-to-use game.

"Brain 21" is a simple brain training game with 120% addiction.
All you have to do is tap the numbers!

The more you play, the more your brain will be activated.
How old is your brain? ??