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Dual N-Back is a scientifically-validated cognitive training task that targets working memory. During the game, you're presented with two simultaneous streams of stimuli: a visual element (a square appearing on a grid) and an audio element (a letter or sound).

Your task is to identify when either stimulus matches what appeared "N" steps back in the sequence. For example, in 2-back, you're checking if the current position or sound matches what happened 2 trials ago.

Research published in peer-reviewed journals has shown that consistent Dual N-Back training can improve fluid intelligence—the ability to reason and solve new problems—as well as working memory capacity.

Here's how to play:

• Watch and Listen: A square will appear on the grid while a sound plays simultaneously.
• Remember: Keep track of positions and sounds from N steps back.
• Respond: Tap the Position button if the current position matches N steps back. Tap the Sound button if the current sound matches N steps back. You can tap both if both match!
• Progress: Score well to advance to higher N-levels and increase the challenge.

Start with 1-back or 2-back to get comfortable with the mechanics, then gradually increase as you improve.

• Classic: The standard Dual N-Back experience with fixed parameters. Great for consistent training and tracking progress.
• Freeplay: Practice mode without affecting your stats. Perfect for experimenting with settings.
• Acceleration: The interval between stimuli decreases as you play, testing your speed and reflexes.
• Rhythm Roulette: Random intervals keep you alert and prevent falling into predictable patterns.
• Backflip: The N-level changes dynamically during play, challenging your cognitive flexibility.
• Shuffle: Audio stimuli switch randomly between piano notes and letter sounds, forcing you to adapt.
• Combo: Get 6 consecutive correct matches to complete the game. The ultimate test of focus and consistency.

Your score rewards consistent, accurate play and is calculated based on several factors:

• Base Score: You start with 5 points per correct match for each stimulus type you have enabled.
• Penalty Factor: Your base score is reduced based on your misses and incorrect responses. The fewer mistakes you make, the less penalty you receive.
• N-Level Bonus: In Classic mode, higher N-levels give you a difficulty multiplier of 1.5^(N-1). So N=2 gives 1.5×, N=3 gives 2.25×, and so on.
• Accuracy Multiplier: Your final score is scaled by your accuracy percentage.
• Stimuli Bonus: Using more stimuli types gives you a multiplier: 0.5× for one, 1× for two, 1.25× for three, or 1.5× for four stimuli.

To restore your previous purchases:

• Open the app and go to the Subscription screen
• Tap the Restore button in the top right corner
• Make sure you're signed into the same Apple ID or Google account used for the original purchase

If you're having trouble restoring, verify you're using the same account that made the original purchase. If issues persist, please contact support.

For iOS (iPhone/iPad):

• Open the Settings app on your device
• Tap your name at the top
• Tap Subscriptions
• Find and tap Dual N-Back
• Tap Cancel Subscription

For Android:

• Open the Google Play Store app
• Tap your profile icon
• Tap Payments & subscriptions → Subscriptions
• Find and tap Dual N-Back
• Tap Cancel subscription

You'll retain access to premium features until the end of your current billing period.

Research suggests that consistent, regular practice yields the best results:

• Recommended: 15-25 minutes per day, 4-5 days per week
• Minimum: 20 minutes, 3 times per week to see improvement
• Studies: Most research showing cognitive gains used 4-5 weeks of consistent training

Use the streak system to build a consistent habit. Even short daily sessions are better than long, infrequent ones.