Comparison

Dual N vs 2 Sides Challenge

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Dual N

This app is a brain game designed to improve working memory and cognitive skills through a challenging memory-training exercise. It offers customizable difficulty, goal setting, and global leaderboards to track progress. An ad-free experience is available via a subscription.

Highlights
  • Working memory training
  • Customizable difficulty (N-value, interval, session length)
  • Goal setting and reminders
  • Global leaderboards
  • Multilingual support
  • Ad-free Pro version
Features
Read full description

Dual NBack – Brain Training to Improve Memory Dual NBack is a fun and challenging brain game designed to strengthen your working memory. Set goals, get reminders, and climb the global leaderboards as you sharpen your mind! What Is Dual NBack? Dual NBack is a memory-training game that presents audio (letters) and visual (positions) sequences simultaneously. Research suggests that consistent play may enhance your working memory—the ability to hold and process information briefly—and also boost short-term recall. How to Play The game starts at Level N=2, where you need to remember the position (square) and the sound (letter) from two turns back. If the current position or sound matches what was shown two turns ago, tap the corresponding button. Strong performance automatically raises your level, but you can manually adjust the difficulty whenever you like. Key Features Customizable Settings Tailor your training: tweak the N-value (number of turns to recall), the interval between sounds/blocks, and session length as you see fit. Reminders & Goals Set daily or weekly targets and enable notifications to help you practice consistently. Global Leaderboards Compare your scores with players worldwide and see how you rank as you improve. Share Function Post your results on social media or messaging apps to challenge your friends and family. Multilingual Support Currently offered in English and Japanese, with more languages on the way. Why Train Your Working Memory? Working memory stores information for a few seconds to minutes, enabling you to make decisions, perform calculations, or tackle other cognitive tasks. Playing Dual NBack regularly can help strengthen this mental capacity, potentially improving focus, concentration, and overall brain agility. Ad-Free Experience with Dual NBack Pro Enjoy a 3-day free trial of Dual NBack Pro to train with no ads or interruptions. If you choose to purchase Dual NBack Pro, the payment is charged to your iTunes account. Renewal fees are charged within 24 hours before the current subscription period ends. You can cancel your subscription anytime: Go to Settings → tap your name → Subscriptions → locate and cancel the subscription you want to end. If you don’t cancel before the trial ends, the paid subscription automatically starts. Privacy Policy: https://goukakuappli.co.jp/privacy End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Summary Strengthen Your Mind: Give your working memory a proven workout. Adapt the Difficulty: Start at N=2 or set your preferred challenge level. Stay Motivated: Leverage reminders, goals, and leaderboards to keep pushing your limits. Go Pro for No Ads: Take advantage of a 3-day free trial and upgrade to an ad-free training experience. Download Dual NBack now and take your cognitive performance to a new level!

About

2 Sides Challenge

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Think you have fast reflexes and sharp focus? Put both hands to the ultimate coordination test! 2 Sides Challenge is an addictive, fast-paced reflex and brain training puzzle game. Your goal is simple but demanding: connect matching shapes on both sides of the screen simultaneously before the timer runs out. As the clock ticks down and the pace accelerates, you'll need lightning-fast reaction speed and split-second hand-eye coordination. Whether you are left-handed, right-handed, or aiming for ambidexterity, this game will push both hemispheres of your brain to work together in complete harmony. KEY FEATURES: • Dual-Hand Reflex Challenge: Control both sides at once. Tap, swipe, and match shapes simultaneously using your left and right hands. • Reaction Speed & Brain Workout: Train your brain, sharpen focus, and boost your reaction time with progressively harder levels. • Race Against the Clock: Every millisecond matters. Stay calm under pressure and connect the pairs before time expires. • Hand-Eye Coordination Test: Challenge your dexterity and fine motor skills in an exciting arcade puzzle experience. • Global Leaderboards: Compete with players worldwide on Apple Game Center and climb to the top of the rankings. • Quick Pick-Up-and-Play: Easy to learn in seconds, endlessly challenging to master. Perfect for quick mental workouts anytime, anywhere! Train your reflexes. Test your coordination. Challenge your friends to beat your high score. Can you keep both sides under control? Download now and put your reaction speed to the test!

Screenshots

Dual N4 screens
2 Sides Challenge2 screens

Verdict

The call

The clearest difference is in-app purchases: 2 Sides Challenge at none against Dual N's 2. 2 Sides Challenge also leads on ads (none vs shown). Dual N's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and update cadence there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Dual N sells 2 in-app purchases, starting at $0.99 per month. 2 Sides Challenge asks for nothing beyond the download.

UpkeepUpdate frequency

Dual N ships an update fortnightly, 2 Sides Challenge every 10 days. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
Dual N versus 2 Sides Challenge: the parameters behind the verdict, then further details
ParameterDual N2 Sides Challenge
PriceFreeFree
Rating4.6 (379 ratings) — better—
Positive reviews50.9% of reviews—
Number of ratings379 — better—
Update frequencyFortnightlyEvery 10 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size199 MB6 MB
Age rating4+4+
DeveloperGOKAKU SUPPLI, LIMITED LIABILITY CO.Dmitrii Nikolaev

In-app purchases

2 purchases

Dual N

Subscriptions1
  • NBack Monthly Subscription3 Days trial$0.991 Month
One-time1
  • Lifetime Pass$12.99
None

2 Sides Challenge

No in-app purchases

Questions

Is Dual N free?
Dual N is free to download, with in-app purchases available.
Is 2 Sides Challenge free?
2 Sides Challenge is free to download, with no in-app purchases.
Do Dual N or 2 Sides Challenge have ads?
Dual N shows ads; 2 Sides Challenge does not.
Which is updated more often, Dual N or 2 Sides Challenge?
Dual N ships an update fortnightly, and 2 Sides Challenge every 10 days. Most recently, Dual N was updated on November 7, 2026 and 2 Sides Challenge on November 8, 2026.

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