Plus15 (+15)
Spatial Logic Puzzle
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
+15 is a daily spatial logic puzzle built around a simple constraint: the grid must be divided into exactly 15 regions, and every region must add up to 15.
Regions can vary in size. Some may contain just two tiles, while others require three or more. All number tiles must be used, and each puzzle has one unique solution. There is no guessing ... only deduction.
How it works:
• Partition the grid into exactly 15 regions
• Each region must sum to 15
• Regions vary in size
• Every tile is used
• Each puzzle has one valid solution
Features:
• A new daily puzzle
• Easy, Medium, and Hard difficulties
• Clean, distraction-free design
• Optional hints when you’re stuck
Sometimes being right leads you wrong. Find the unique solution.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
More Puzzles Added! And game mechanics tracking added
The developer, Engine Lane, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Engine Lane Capital Corp.
- Size
- 44.6 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 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
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- 5 Hints $2.99
- Copyright
- © 2026 Engine Lane Capital Inc.