Serial 7s
Serial Sevens Subtraction.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Serial 7s is a brain training game that tests how fast you can perform continuous subtraction of 7 from a starting number.
Inspired by the classic "Serial 7s" task—a standard component of the Mini-Mental State Examination (MMSE)—this game gives a proven cognitive test a fresh twist.
Starting with a randomly generated number between 99 and 105, your total time to complete 14 consecutive subtractions of 7 is measured.
Serial subtraction by 7 is widely used to evaluate focus, attention span, and working memory. Regular practice can help sharpen your mind and boost cognitive fitness.
Recommended for anyone interested in brain training, keeping their mind active, or supporting long-term cognitive health and dementia prevention.
Ratings & Reviews
Game modes updated to 2 options.
Added 'Remove Ads' in-app purchase.
The developer, HFX Lab, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- HFX Lab
- Size
- 44.5 MB
- Category
- Trivia
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
9+
- 9+
- Infrequent
Cartoon or Fantasy Violence
Contains
Advertising
- In-App Purchases
Yes
- Pro Version $0.99
- Copyright
- © 2023 HFX Lab