Dual N-Back: Brain-Training is a free iPhone app developed by GOKAKU SUPPLI LIMITED LIABILITY CO. It is a fun and challenging way to exercise your working memory and improve your cognitive skills. The app includes a reminder and goal function, allowing you to set targets for yourself and track your progress.

The game is based on the concept of Dual N-back, which involves remembering audio and visual sequences simultaneously. Numerous studies have shown that this type of memory training can enhance working memory and short-term memory.

Starting at level 2, where you have to remember the position and sound from two turns back, the game gradually increases in difficulty as you progress. You are required to click the corresponding buttons when the position or sound matches the previous sequences.

The app allows you to customize the game settings according to your preferences. Good performance will unlock higher levels, or you can manually set the level that suits you best.

Dual N-Back: Brain-Training offers an ad-free experience, allowing you to fully focus on the game. If you want to take your training to the next level, you can try the Dual Nback Pro version with a 3-day free trial.

Please note that if you choose to purchase Dual Nback Pro, payment will be charged to your iTunes account. You can cancel your subscription at any time through your device settings.