Single N-Back

I have just created my first Android app. It is a simple game, called Single N-Back. It has been shown in multiple studies that this game can improve your fluid intelligence.

You can get it here:

Game Rules

The game rules are very simple:
You are shown a sequence of numbers and your task is to click the button if you see the current number matches the one from N steps earlier in the sequence.

For example, in 2-Back, when you get the sequence

5, 3, 0, 4, 2, 8, 9, 1, 9

you should press the button because the currently showen numer 9 is the same as the number shown 2 steps back.

You start with 2-Back, and if more than 80% is correct, you can unlock the next N-back level.


Here are some screenshots of the extremely ugly clean user interface:


Since I have not made this test up by myself, here are some papers that explain the validity that that kind of game actually improves fluid intelligence:

Have fun!

Privacy Policy

Ankerl respect the privacy concerns of the users of this site and have created this privacy policy to explain what we will do with information gathered from users, how we are gathering that information and how the information will be stored, managed and protected.

The personal information we collect allows us to keep you posted latest product announcements, software updates. It also helps us to improve our services, content, and advertising. We also use personal information to help us develop, deliver, and improve our products, services, content, and advertising. We may also use personal information for internal purposes such as auditing, data analysis, and research to improve Ankerl products, services, and customer communications.

Personal Data is collected for the following purposes and using the following services:


These services allow User Data to be utilized for advertising communication purposes displayed in the form of banners and other advertisements on Ankerl apps, possibly based on User interests. This does not mean that all Personal Data are used for this purpose. Information and conditions of use are shown below.


AdMob is an advertising service provided by AdMob Google Inc.
Personal Data collected: Usage data.
Admob has it’s own Privacy Policy.


The services contained in this section enable the Owner to monitor and analyze web traffic and can be used to keep track of User behavior.

Google Analytics

Google Analytics is a web analysis service provided by Google Inc. Google utilizes the Data collected to track and examine the use of Ankerl Apps,to prepare reports on its activities and share them with other Google services. Google may use the Data collected to contextualize and personalize the ads of its own advertising network.

Childrens Online Privacy Protection Act Compliance

We are in compliance with the requirements of COPPA, we do not collect any information from anyone under 13 years of age. Our products and services are all directed to people who are at least 13 years old or older.

Changes to our Privacy Policy

If we decide to change our privacy policy, we will post those changes on this page.

Your Consent

By using Ankerl apps you consent to this privacy policy.

Contacting Us

If there are any questions regarding this privacy policy you may contact us using the information below.

2 Comments on "Single N-Back"

Notify of

4 years 10 months ago

Thank you very much, a very useful app.
Can you make this exercise more variable, e.g. using letters or chinese/japanese characters etc. I think such an exercise could boost visual memory, it would be great.

Jonathan Roseland
3 years 6 months ago

Hey Martin, that’s cool, thanks for contributing to the Android marketplace! Here’s an infographic I hope you’ll find useful on two technologies that compliment the N-Back app. For further explanation:,-supermemo-and-dual-n-back-training.html